forked from OctaForge/libostd
951 lines
25 KiB
C++
951 lines
25 KiB
C++
/* Algorithms for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_ALGORITHM_HH
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#define OSTD_ALGORITHM_HH
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#include <math.h>
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#include <utility>
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#include "ostd/functional.hh"
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#include "ostd/range.hh"
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#include "ostd/utility.hh"
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#include "ostd/initializer_list.hh"
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namespace ostd {
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/* partitioning */
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template<typename R, typename U>
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inline R partition(R range, U pred) {
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R ret = range;
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for (; !range.empty(); range.pop_front()) {
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if (pred(range.front())) {
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detail::swap_adl(range.front(), ret.front());
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ret.pop_front();
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}
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}
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return ret;
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}
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template<typename F>
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inline auto partition(F &&func) {
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return [func = std::forward<F>(func)](auto &&obj) mutable {
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return partition(
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std::forward<decltype(obj)>(obj), std::forward<F>(func)
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);
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};
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}
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template<typename R, typename P>
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inline bool is_partitioned(R range, P pred) {
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for (; !range.empty() && pred(range.front()); range.pop_front());
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for (; !range.empty(); range.pop_front()) {
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if (pred(range.front())) {
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return false;
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}
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}
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return true;
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}
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template<typename F>
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inline auto is_partitioned(F &&func) {
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return [func = std::forward<F>(func)](auto &&obj) mutable {
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return is_partitioned(
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std::forward<decltype(obj)>(obj), std::forward<F>(func)
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);
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};
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}
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/* sorting */
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namespace detail {
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template<typename R, typename C>
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static void insort(R range, C &compare) {
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RangeSize<R> rlen = range.size();
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for (RangeSize<R> i = 1; i < rlen; ++i) {
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RangeSize<R> j = i;
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RangeValue<R> v(std::move(range[i]));
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while (j > 0 && !compare(range[j - 1], v)) {
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range[j] = range[j - 1];
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--j;
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}
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range[j] = std::move(v);
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}
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}
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template<typename R, typename C>
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static void hs_sift_down(
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R range, RangeSize<R> s, RangeSize<R> e, C &compare
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) {
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RangeSize<R> r = s;
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while ((r * 2 + 1) <= e) {
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RangeSize<R> ch = r * 2 + 1;
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RangeSize<R> sw = r;
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if (compare(range[sw], range[ch])) {
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sw = ch;
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}
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if (((ch + 1) <= e) && compare(range[sw], range[ch + 1])) {
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sw = ch + 1;
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}
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if (sw != r) {
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detail::swap_adl(range[r], range[sw]);
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r = sw;
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} else {
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return;
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}
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}
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}
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template<typename R, typename C>
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static void heapsort(R range, C &compare) {
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RangeSize<R> len = range.size();
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RangeSize<R> st = (len - 2) / 2;
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for (;;) {
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detail::hs_sift_down(range, st, len - 1, compare);
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if (st-- == 0) {
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break;
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}
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}
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RangeSize<R> e = len - 1;
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while (e > 0) {
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detail::swap_adl(range[e], range[0]);
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--e;
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detail::hs_sift_down(range, 0, e, compare);
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}
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}
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template<typename R, typename C>
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static void introloop(R range, C &compare, RangeSize<R> depth) {
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if (range.size() <= 10) {
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detail::insort(range, compare);
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return;
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}
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if (depth == 0) {
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detail::heapsort(range, compare);
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return;
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}
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detail::swap_adl(range[range.size() / 2], range.back());
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RangeSize<R> pi = 0;
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R pr = range;
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pr.pop_back();
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for (; !pr.empty(); pr.pop_front()) {
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if (compare(pr.front(), range.back())) {
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detail::swap_adl(pr.front(), range[pi++]);
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}
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}
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detail::swap_adl(range[pi], range.back());
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detail::introloop(range.slice(0, pi), compare, depth - 1);
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detail::introloop(
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range.slice(pi + 1, range.size()), compare, depth - 1
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);
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}
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template<typename R, typename C>
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inline void introsort(R range, C &compare) {
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detail::introloop(
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range, compare,
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static_cast<RangeSize<R>>(2 * (log(range.size()) / log(2)))
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);
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}
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} /* namespace detail */
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template<typename R, typename C>
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inline R sort_cmp(R range, C compare) {
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detail::introsort(range, compare);
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return range;
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}
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template<typename C>
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inline auto sort_cmp(C &&compare) {
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return [compare = std::forward<C>(compare)](auto &&obj) mutable {
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return sort_cmp(
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std::forward<decltype(obj)>(obj), std::forward<C>(compare)
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);
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};
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}
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template<typename R>
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inline R sort(R range) {
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return sort_cmp(range, Less<RangeValue<R>>());
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}
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inline auto sort() {
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return [](auto &&obj) { return sort(std::forward<decltype(obj)>(obj)); };
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}
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/* min/max(_element) */
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template<typename T>
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inline T const &min(T const &a, T const &b) {
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return (a < b) ? a : b;
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}
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template<typename T, typename C>
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inline T const &min_cmp(T const &a, T const &b, C compare) {
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return compare(a, b) ? a : b;
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}
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template<typename T>
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inline T const &max(T const &a, T const &b) {
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return (a < b) ? b : a;
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}
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template<typename T, typename C>
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inline T const &max_cmp(T const &a, T const &b, C compare) {
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return compare(a, b) ? b : a;
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}
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template<typename R>
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inline R min_element(R range) {
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R r = range;
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for (; !range.empty(); range.pop_front()) {
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if (ostd::min(r.front(), range.front()) == range.front()) {
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r = range;
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}
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}
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return r;
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}
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template<typename R, typename C>
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inline R min_element_cmp(R range, C compare) {
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R r = range;
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for (; !range.empty(); range.pop_front()) {
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if (ostd::min_cmp(r.front(), range.front(), compare) == range.front()) {
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r = range;
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}
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}
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return r;
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}
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inline auto min_element() {
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return [](auto &&obj) {
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return min_element(std::forward<decltype(obj)>(obj));
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};
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}
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template<typename C>
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inline auto min_element_cmp(C &&compare) {
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return [compare = std::forward<C>(compare)](auto &&obj) mutable {
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return min_element_cmp(
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std::forward<decltype(obj)>(obj), std::forward<C>(compare)
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);
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};
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}
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template<typename R>
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inline R max_element(R range) {
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R r = range;
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for (; !range.empty(); range.pop_front()) {
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if (ostd::max(r.front(), range.front()) == range.front()) {
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r = range;
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}
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}
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return r;
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}
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template<typename R, typename C>
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inline R max_element_cmp(R range, C compare) {
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R r = range;
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for (; !range.empty(); range.pop_front()) {
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if (ostd::max_cmp(r.front(), range.front(), compare) == range.front()) {
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r = range;
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}
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}
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return r;
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}
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inline auto max_element() {
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return [](auto &&obj) {
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return max_element(std::forward<decltype(obj)>(obj));
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};
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}
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template<typename C>
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inline auto max_element_cmp(C &&compare) {
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return [compare = std::forward<C>(compare)](auto &&obj) mutable {
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return max_element_cmp(
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std::forward<decltype(obj)>(obj), std::forward<C>(compare)
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);
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};
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}
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template<typename T>
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inline T min(std::initializer_list<T> il) {
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return ostd::min_element(ostd::iter(il)).front();
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}
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template<typename T, typename C>
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inline T min_cmp(std::initializer_list<T> il, C compare) {
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return ostd::min_element_cmp(ostd::iter(il), compare).front();
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}
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template<typename T>
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inline T max(std::initializer_list<T> il) {
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return ostd::max_element(ostd::iter(il)).front();
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}
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template<typename T, typename C>
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inline T max_cmp(std::initializer_list<T> il, C compare) {
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return ostd::max_element_cmp(ostd::iter(il), compare).front();
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}
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/* clamp */
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template<typename T, typename U>
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inline T clamp(T const &v, U const &lo, U const &hi) {
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return ostd::max(T(lo), ostd::min(v, T(hi)));
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}
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template<typename T, typename U, typename C>
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inline T clamp(T const &v, U const &lo, U const &hi, C compare) {
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return ostd::max_cmp(T(lo), ostd::min_cmp(v, T(hi), compare), compare);
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}
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/* lexicographical compare */
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template<typename R1, typename R2>
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inline bool lexicographical_compare(R1 range1, R2 range2) {
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while (!range1.empty() && !range2.empty()) {
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if (range1.front() < range2.front()) {
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return true;
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}
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if (range2.front() < range1.front()) {
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return false;
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}
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range1.pop_front();
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range2.pop_front();
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}
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return (range1.empty() && !range2.empty());
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}
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template<typename R>
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inline auto lexicographical_compare(R &&range) {
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return [range = std::forward<R>(range)](auto &&obj) mutable {
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return lexicographical_compare(
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std::forward<decltype(obj)>(obj), std::forward<R>(range)
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);
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};
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}
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template<typename R1, typename R2, typename C>
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inline bool lexicographical_compare_cmp(R1 range1, R2 range2, C compare) {
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while (!range1.empty() && !range2.empty()) {
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if (compare(range1.front(), range2.front())) {
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return true;
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}
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if (compare(range2.front(), range1.front())) {
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return false;
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}
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range1.pop_front();
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range2.pop_front();
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}
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return (range1.empty() && !range2.empty());
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}
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template<typename R, typename C>
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inline auto lexicographical_compare_cmp(R &&range, C &&compare) {
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return [
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range = std::forward<R>(range), compare = std::forward<C>(compare)
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](auto &&obj) mutable {
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return lexicographical_compare_cmp(
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std::forward<decltype(obj)>(obj), std::forward<R>(range),
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std::forward<C>(compare)
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);
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};
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}
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/* algos that don't change the range */
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template<typename R, typename F>
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inline F for_each(R range, F func) {
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for (; !range.empty(); range.pop_front()) {
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func(range.front());
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}
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return std::move(func);
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}
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template<typename F>
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inline auto for_each(F &&func) {
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return [func = std::forward<F>(func)](auto &&obj) mutable {
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return for_each(std::forward<decltype(obj)>(obj), std::forward<F>(func));
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};
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}
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template<typename R, typename P>
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inline bool all_of(R range, P pred) {
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for (; !range.empty(); range.pop_front()) {
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if (!pred(range.front())) {
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return false;
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}
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}
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return true;
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}
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template<typename F>
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inline auto all_of(F &&func) {
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return [func = std::forward<F>(func)](auto &&obj) mutable {
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return all_of(std::forward<decltype(obj)>(obj), std::forward<F>(func));
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};
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}
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template<typename R, typename P>
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inline bool any_of(R range, P pred) {
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for (; !range.empty(); range.pop_front())
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if (pred(range.front())) return true;
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return false;
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}
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template<typename F>
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inline auto any_of(F &&func) {
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return [func = std::forward<F>(func)](auto &&obj) mutable {
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return any_of(std::forward<decltype(obj)>(obj), std::forward<F>(func));
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};
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}
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template<typename R, typename P>
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inline bool none_of(R range, P pred) {
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for (; !range.empty(); range.pop_front())
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if (pred(range.front())) return false;
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return true;
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}
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template<typename F>
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inline auto none_of(F &&func) {
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return [func = std::forward<F>(func)](auto &&obj) mutable {
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return none_of(std::forward<decltype(obj)>(obj), std::forward<F>(func));
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};
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}
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template<typename R, typename T>
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inline R find(R range, T const &v) {
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for (; !range.empty(); range.pop_front()) {
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if (range.front() == v) {
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break;
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}
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}
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return range;
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}
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template<typename T>
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inline auto find(T &&v) {
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return [v = std::forward<T>(v)](auto &&obj) mutable {
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return find(std::forward<decltype(obj)>(obj), std::forward<T>(v));
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};
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}
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template<typename R, typename T>
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inline R find_last(R range, T const &v) {
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range = find(range, v);
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if (!range.empty()) {
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for (;;) {
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R prev = range;
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prev.pop_front();
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R r = find(prev, v);
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if (r.empty()) {
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break;
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}
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range = r;
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}
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}
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return range;
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}
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template<typename T>
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inline auto find_last(T &&v) {
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return [v = std::forward<T>(v)](auto &&obj) mutable {
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return find_last(std::forward<decltype(obj)>(obj), std::forward<T>(v));
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};
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}
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template<typename R, typename P>
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inline R find_if(R range, P pred) {
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for (; !range.empty(); range.pop_front()) {
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if (pred(range.front())) {
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break;
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}
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}
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return range;
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}
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template<typename F>
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inline auto find_if(F &&func) {
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return [func = std::forward<F>(func)](auto &&obj) mutable {
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return find_if(std::forward<decltype(obj)>(obj), std::forward<F>(func));
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};
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}
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template<typename R, typename P>
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inline R find_if_not(R range, P pred) {
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for (; !range.empty(); range.pop_front()) {
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if (!pred(range.front())) {
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break;
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}
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}
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return range;
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}
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template<typename F>
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inline auto find_if_not(F &&func) {
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return [func = std::forward<F>(func)](auto &&obj) mutable {
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return find_if_not(
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std::forward<decltype(obj)>(obj), std::forward<F>(func)
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);
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};
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}
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template<typename R1, typename R2, typename C>
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inline R1 find_one_of_cmp(R1 range, R2 values, C compare) {
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for (; !range.empty(); range.pop_front()) {
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for (R2 rv = values; !rv.empty(); rv.pop_front()) {
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if (compare(range.front(), rv.front())) {
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return range;
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}
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}
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}
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return range;
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}
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template<typename R, typename C>
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inline auto find_one_of_cmp(R &&values, C &&compare) {
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return [
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values = std::forward<R>(values), compare = std::forward<C>(compare)
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](auto &&obj) mutable {
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return find_one_of_cmp(
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std::forward<decltype(obj)>(obj), std::forward<R>(values),
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std::forward<C>(compare)
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);
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};
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}
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template<typename R1, typename R2>
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inline R1 find_one_of(R1 range, R2 values) {
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for (; !range.empty(); range.pop_front()) {
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for (R2 rv = values; !rv.empty(); rv.pop_front()) {
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if (range.front() == rv.front()) {
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return range;
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}
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}
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}
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return range;
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}
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template<typename R>
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inline auto find_one_of(R &&values) {
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return [values = std::forward<R>(values)](auto &&obj) mutable {
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return find_one_of(
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std::forward<decltype(obj)>(obj), std::forward<R>(values)
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);
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};
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}
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template<typename R, typename T>
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inline RangeSize<R> count(R range, T const &v) {
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RangeSize<R> ret = 0;
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for (; !range.empty(); range.pop_front()) {
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if (range.front() == v) {
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++ret;
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}
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}
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return ret;
|
|
}
|
|
|
|
template<typename T>
|
|
inline auto count(T &&v) {
|
|
return [v = std::forward<T>(v)](auto &&obj) mutable {
|
|
return count(std::forward<decltype(obj)>(obj), std::forward<T>(v));
|
|
};
|
|
}
|
|
|
|
template<typename R, typename P>
|
|
inline RangeSize<R> count_if(R range, P pred) {
|
|
RangeSize<R> ret = 0;
|
|
for (; !range.empty(); range.pop_front()) {
|
|
if (pred(range.front())) {
|
|
++ret;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
template<typename F>
|
|
inline auto count_if(F &&func) {
|
|
return [func = std::forward<F>(func)](auto &&obj) mutable {
|
|
return count_if(std::forward<decltype(obj)>(obj), std::forward<F>(func));
|
|
};
|
|
}
|
|
|
|
template<typename R, typename P>
|
|
inline RangeSize<R> count_if_not(R range, P pred) {
|
|
RangeSize<R> ret = 0;
|
|
for (; !range.empty(); range.pop_front()) {
|
|
if (!pred(range.front())) {
|
|
++ret;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
template<typename F>
|
|
inline auto count_if_not(F &&func) {
|
|
return [func = std::forward<F>(func)](auto &&obj) mutable {
|
|
return count_if_not(
|
|
std::forward<decltype(obj)>(obj), std::forward<F>(func)
|
|
);
|
|
};
|
|
}
|
|
|
|
template<typename R>
|
|
inline bool equal(R range1, R range2) {
|
|
for (; !range1.empty(); range1.pop_front()) {
|
|
if (range2.empty() || (range1.front() != range2.front())) {
|
|
return false;
|
|
}
|
|
range2.pop_front();
|
|
}
|
|
return range2.empty();
|
|
}
|
|
|
|
template<typename R>
|
|
inline auto equal(R &&range) {
|
|
return [range = std::forward<R>(range)](auto &&obj) mutable {
|
|
return equal(std::forward<decltype(obj)>(obj), std::forward<R>(range));
|
|
};
|
|
}
|
|
|
|
template<typename R>
|
|
R slice_until(R range1, R range2) {
|
|
return range1.slice(0, range1.distance_front(range2));
|
|
}
|
|
|
|
template<typename R>
|
|
inline auto slice_until(R &&range) {
|
|
return [range = std::forward<R>(range)](auto &&obj) mutable {
|
|
return slice_until(
|
|
std::forward<decltype(obj)>(obj), std::forward<R>(range)
|
|
);
|
|
};
|
|
}
|
|
|
|
/* algos that modify ranges or work with output ranges */
|
|
|
|
template<typename R1, typename R2>
|
|
inline R2 copy(R1 irange, R2 orange) {
|
|
for (; !irange.empty(); irange.pop_front()) {
|
|
orange.put(irange.front());
|
|
}
|
|
return orange;
|
|
}
|
|
|
|
template<typename R1, typename R2, typename P>
|
|
inline R2 copy_if(R1 irange, R2 orange, P pred) {
|
|
for (; !irange.empty(); irange.pop_front()) {
|
|
if (pred(irange.front())) {
|
|
orange.put(irange.front());
|
|
}
|
|
}
|
|
return orange;
|
|
}
|
|
|
|
template<typename R1, typename R2, typename P>
|
|
inline R2 copy_if_not(R1 irange, R2 orange, P pred) {
|
|
for (; !irange.empty(); irange.pop_front()) {
|
|
if (!pred(irange.front())) {
|
|
orange.put(irange.front());
|
|
}
|
|
}
|
|
return orange;
|
|
}
|
|
|
|
template<typename R1, typename R2>
|
|
inline R2 move(R1 irange, R2 orange) {
|
|
for (; !irange.empty(); irange.pop_front()) {
|
|
orange.put(std::move(irange.front()));
|
|
}
|
|
return orange;
|
|
}
|
|
|
|
template<typename R>
|
|
inline void reverse(R range) {
|
|
while (!range.empty()) {
|
|
detail::swap_adl(range.front(), range.back());
|
|
range.pop_front();
|
|
range.pop_back();
|
|
}
|
|
}
|
|
|
|
template<typename R1, typename R2>
|
|
inline R2 reverse_copy(R1 irange, R2 orange) {
|
|
for (; !irange.empty(); irange.pop_back()) {
|
|
orange.put(irange.back());
|
|
}
|
|
return orange;
|
|
}
|
|
|
|
template<typename R, typename T>
|
|
inline void fill(R range, T const &v) {
|
|
for (; !range.empty(); range.pop_front()) {
|
|
range.front() = v;
|
|
}
|
|
}
|
|
|
|
template<typename R, typename F>
|
|
inline void generate(R range, F gen) {
|
|
for (; !range.empty(); range.pop_front()) {
|
|
range.front() = gen();
|
|
}
|
|
}
|
|
|
|
template<typename R1, typename R2>
|
|
inline std::pair<R1, R2> swap_ranges(R1 range1, R2 range2) {
|
|
while (!range1.empty() && !range2.empty()) {
|
|
detail::swap_adl(range1.front(), range2.front());
|
|
range1.pop_front();
|
|
range2.pop_front();
|
|
}
|
|
return std::make_pair(range1, range2);
|
|
}
|
|
|
|
template<typename R, typename T>
|
|
inline void iota(R range, T value) {
|
|
for (; !range.empty(); range.pop_front()) {
|
|
range.front() = value++;
|
|
}
|
|
}
|
|
|
|
template<typename R, typename T>
|
|
inline T foldl(R range, T init) {
|
|
for (; !range.empty(); range.pop_front()) {
|
|
init = init + range.front();
|
|
}
|
|
return init;
|
|
}
|
|
|
|
template<typename R, typename T, typename F>
|
|
inline T foldl_f(R range, T init, F func) {
|
|
for (; !range.empty(); range.pop_front()) {
|
|
init = func(init, range.front());
|
|
}
|
|
return init;
|
|
}
|
|
|
|
template<typename T>
|
|
inline auto foldl(T &&init) {
|
|
return [init = std::forward<T>(init)](auto &&obj) mutable {
|
|
return foldl(std::forward<decltype(obj)>(obj), std::forward<T>(init));
|
|
};
|
|
}
|
|
template<typename T, typename F>
|
|
inline auto foldl_f(T &&init, F &&func) {
|
|
return [
|
|
init = std::forward<T>(init), func = std::forward<F>(func)
|
|
](auto &&obj) mutable {
|
|
return foldl_f(
|
|
std::forward<decltype(obj)>(obj), std::forward<T>(init),
|
|
std::forward<F>(func)
|
|
);
|
|
};
|
|
}
|
|
|
|
template<typename R, typename T>
|
|
inline T foldr(R range, T init) {
|
|
for (; !range.empty(); range.pop_back()) {
|
|
init = init + range.back();
|
|
}
|
|
return init;
|
|
}
|
|
|
|
template<typename R, typename T, typename F>
|
|
inline T foldr_f(R range, T init, F func) {
|
|
for (; !range.empty(); range.pop_back()) {
|
|
init = func(init, range.back());
|
|
}
|
|
return init;
|
|
}
|
|
|
|
template<typename T>
|
|
inline auto foldr(T &&init) {
|
|
return [init = std::forward<T>(init)](auto &&obj) mutable {
|
|
return foldr(std::forward<decltype(obj)>(obj), std::forward<T>(init));
|
|
};
|
|
}
|
|
template<typename T, typename F>
|
|
inline auto foldr_f(T &&init, F &&func) {
|
|
return [
|
|
init = std::forward<T>(init), func = std::forward<F>(func)
|
|
](auto &&obj) mutable {
|
|
return foldr_f(
|
|
std::forward<decltype(obj)>(obj), std::forward<T>(init),
|
|
std::forward<F>(func)
|
|
);
|
|
};
|
|
}
|
|
|
|
template<typename T, typename F, typename R>
|
|
struct MapRange: InputRange<
|
|
MapRange<T, F, R>, RangeCategory<T>, R, R, RangeSize<T>
|
|
> {
|
|
private:
|
|
T p_range;
|
|
Decay<F> p_func;
|
|
|
|
public:
|
|
MapRange() = delete;
|
|
template<typename FF>
|
|
MapRange(T const &range, FF &&func):
|
|
p_range(range), p_func(std::forward<FF>(func)) {}
|
|
MapRange(MapRange const &it):
|
|
p_range(it.p_range), p_func(it.p_func) {}
|
|
MapRange(MapRange &&it):
|
|
p_range(std::move(it.p_range)), p_func(std::move(it.p_func)) {}
|
|
|
|
MapRange &operator=(MapRange const &v) {
|
|
p_range = v.p_range;
|
|
p_func = v.p_func;
|
|
return *this;
|
|
}
|
|
MapRange &operator=(MapRange &&v) {
|
|
p_range = std::move(v.p_range);
|
|
p_func = std::move(v.p_func);
|
|
return *this;
|
|
}
|
|
|
|
bool empty() const { return p_range.empty(); }
|
|
RangeSize<T> size() const { return p_range.size(); }
|
|
|
|
bool equals_front(MapRange const &r) const {
|
|
return p_range.equals_front(r.p_range);
|
|
}
|
|
bool equals_back(MapRange const &r) const {
|
|
return p_range.equals_front(r.p_range);
|
|
}
|
|
|
|
RangeDifference<T> distance_front(MapRange const &r) const {
|
|
return p_range.distance_front(r.p_range);
|
|
}
|
|
RangeDifference<T> distance_back(MapRange const &r) const {
|
|
return p_range.distance_back(r.p_range);
|
|
}
|
|
|
|
bool pop_front() { return p_range.pop_front(); }
|
|
bool pop_back() { return p_range.pop_back(); }
|
|
|
|
bool push_front() { return p_range.pop_front(); }
|
|
bool push_back() { return p_range.push_back(); }
|
|
|
|
RangeSize<T> pop_front_n(RangeSize<T> n) {
|
|
p_range.pop_front_n(n);
|
|
}
|
|
RangeSize<T> pop_back_n(RangeSize<T> n) {
|
|
p_range.pop_back_n(n);
|
|
}
|
|
|
|
RangeSize<T> push_front_n(RangeSize<T> n) {
|
|
return p_range.push_front_n(n);
|
|
}
|
|
RangeSize<T> push_back_n(RangeSize<T> n) {
|
|
return p_range.push_back_n(n);
|
|
}
|
|
|
|
R front() const { return p_func(p_range.front()); }
|
|
R back() const { return p_func(p_range.back()); }
|
|
|
|
R operator[](RangeSize<T> idx) const {
|
|
return p_func(p_range[idx]);
|
|
}
|
|
|
|
MapRange slice(RangeSize<T> start, RangeSize<T> end) {
|
|
return MapRange(p_range.slice(start, end), p_func);
|
|
}
|
|
};
|
|
|
|
namespace detail {
|
|
template<typename R, typename F>
|
|
using MapReturnType = decltype(declval<F>()(declval<RangeReference<R>>()));
|
|
}
|
|
|
|
template<typename R, typename F>
|
|
inline MapRange<R, F, detail::MapReturnType<R, F>> map(R range, F func) {
|
|
return MapRange<R, F, detail::MapReturnType<R, F>>(range, std::move(func));
|
|
}
|
|
|
|
template<typename F>
|
|
inline auto map(F &&func) {
|
|
return [func = std::forward<F>(func)](auto &&obj) mutable {
|
|
return map(std::forward<decltype(obj)>(obj), std::forward<F>(func));
|
|
};
|
|
}
|
|
|
|
template<typename T, typename F>
|
|
struct FilterRange: InputRange<
|
|
FilterRange<T, F>, CommonType<RangeCategory<T>, ForwardRangeTag>,
|
|
RangeValue<T>, RangeReference<T>, RangeSize<T>
|
|
> {
|
|
private:
|
|
T p_range;
|
|
Decay<F> p_pred;
|
|
|
|
void advance_valid() {
|
|
while (!p_range.empty() && !p_pred(front())) {
|
|
p_range.pop_front();
|
|
}
|
|
}
|
|
|
|
public:
|
|
FilterRange() = delete;
|
|
template<typename P>
|
|
FilterRange(T const &range, P &&pred):
|
|
p_range(range), p_pred(std::forward<P>(pred))
|
|
{
|
|
advance_valid();
|
|
}
|
|
FilterRange(FilterRange const &it):
|
|
p_range(it.p_range), p_pred(it.p_pred)
|
|
{
|
|
advance_valid();
|
|
}
|
|
FilterRange(FilterRange &&it):
|
|
p_range(std::move(it.p_range)), p_pred(std::move(it.p_pred))
|
|
{
|
|
advance_valid();
|
|
}
|
|
|
|
FilterRange &operator=(FilterRange const &v) {
|
|
p_range = v.p_range;
|
|
p_pred = v.p_pred;
|
|
advance_valid();
|
|
return *this;
|
|
}
|
|
FilterRange &operator=(FilterRange &&v) {
|
|
p_range = std::move(v.p_range);
|
|
p_pred = std::move(v.p_pred);
|
|
advance_valid();
|
|
return *this;
|
|
}
|
|
|
|
bool empty() const { return p_range.empty(); }
|
|
|
|
bool equals_front(FilterRange const &r) const {
|
|
return p_range.equals_front(r.p_range);
|
|
}
|
|
|
|
bool pop_front() {
|
|
bool ret = p_range.pop_front();
|
|
advance_valid();
|
|
return ret;
|
|
}
|
|
|
|
RangeReference<T> front() const { return p_range.front(); }
|
|
};
|
|
|
|
namespace detail {
|
|
template<typename R, typename P>
|
|
using FilterPred = EnableIf<
|
|
IsSame<decltype(declval<P>()(declval<RangeReference<R>>())), bool>, P
|
|
>;
|
|
}
|
|
|
|
template<typename R, typename P>
|
|
inline FilterRange<R, detail::FilterPred<R, P>> filter(R range, P pred) {
|
|
return FilterRange<R, P>(range, std::move(pred));
|
|
}
|
|
|
|
template<typename F>
|
|
inline auto filter(F &&func) {
|
|
return [func = std::forward<F>(func)](auto &&obj) mutable {
|
|
return filter(std::forward<decltype(obj)>(obj), std::forward<F>(func));
|
|
};
|
|
}
|
|
|
|
} /* namespace ostd */
|
|
|
|
#endif
|