387 lines
10 KiB
C++
387 lines
10 KiB
C++
/* Utilities 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_UTILITY_HH
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#define OSTD_UTILITY_HH
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#include <stddef.h>
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#include "ostd/type_traits.hh"
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#include "ostd/internal/tuple.hh"
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namespace ostd {
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/* move */
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template<typename T>
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inline constexpr RemoveReference<T> &&move(T &&v) {
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return static_cast<RemoveReference<T> &&>(v);
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}
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/* forward */
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template<typename T>
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inline constexpr T &&forward(RemoveReference<T> &v) {
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return static_cast<T &&>(v);
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}
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template<typename T>
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inline constexpr T &&forward(RemoveReference<T> &&v) {
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return static_cast<T &&>(v);
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}
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/* exchange */
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template<typename T, typename U = T>
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inline T exchange(T &v, U &&nv) {
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T old = move(v);
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v = forward<U>(nv);
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return old;
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}
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/* declval */
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template<typename T> AddRvalueReference<T> declval();
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/* swap */
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namespace detail {
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template<typename T>
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auto test_swap(int) ->
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BoolConstant<IsVoid<decltype(declval<T>().swap(declval<T &>()))>>;
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template<typename>
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False test_swap(...);
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template<typename T> inline void swap_fb(T &a, T &b, EnableIf<
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decltype(test_swap<T>(0))::value, bool
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> = true) {
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a.swap(b);
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}
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template<typename T> inline void swap_fb(T &a, T &b, EnableIf<
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!decltype(test_swap<T>(0))::value, bool
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> = true) {
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T c(move(a));
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a = move(b);
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b = move(c);
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}
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}
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template<typename T> inline void swap(T &a, T &b) {
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detail::swap_fb(a, b);
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}
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template<typename T, Size N> inline void swap(T (&a)[N], T (&b)[N]) {
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for (Size i = 0; i < N; ++i) {
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swap(a[i], b[i]);
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}
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}
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namespace detail {
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template<typename T> inline void swap_adl(T &a, T &b) {
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using ostd::swap;
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swap(a, b);
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}
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}
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/* pair */
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template<typename T, typename U>
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struct Pair {
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T first;
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U second;
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Pair() = default;
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~Pair() = default;
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Pair(const Pair &) = default;
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Pair(Pair &&) = default;
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Pair(const T &x, const U &y): first(x), second(y) {}
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template<typename TT, typename UU>
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Pair(TT &&x, UU &&y):
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first(forward<TT>(x)), second(forward<UU>(y)) {}
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template<typename TT, typename UU>
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Pair(const Pair<TT, UU> &v): first(v.first), second(v.second) {}
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template<typename TT, typename UU>
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Pair(Pair<TT, UU> &&v):
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first(move(v.first)), second(move(v.second)) {}
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Pair &operator=(const Pair &v) {
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first = v.first;
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second = v.second;
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return *this;
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}
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template<typename TT, typename UU>
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Pair &operator=(const Pair<TT, UU> &v) {
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first = v.first;
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second = v.second;
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return *this;
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}
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Pair &operator=(Pair &&v) {
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first = move(v.first);
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second = move(v.second);
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return *this;
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}
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template<typename TT, typename UU>
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Pair &operator=(Pair<TT, UU> &&v) {
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first = forward<TT>(v.first);
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second = forward<UU>(v.second);
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return *this;
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}
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void swap(Pair &v) {
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detail::swap_adl(first, v.first);
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detail::swap_adl(second, v.second);
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}
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};
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template<typename T> struct ReferenceWrapper;
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namespace detail {
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template<typename T>
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struct MakePairRetBase {
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using Type = T;
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};
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template<typename T>
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struct MakePairRetBase<ReferenceWrapper<T>> {
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using Type = T &;
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};
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template<typename T>
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struct MakePairRet {
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using Type = typename detail::MakePairRetBase<Decay<T>>::Type;
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};
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} /* namespace detail */
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template<typename T, typename U>
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inline Pair<typename detail::MakePairRet<T>::Type,
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typename detail::MakePairRet<U>::Type
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> make_pair(T &&a, U &&b) {
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return Pair<typename detail::MakePairRet<T>::Type,
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typename detail::MakePairRet<U>::Type
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>(forward<T>(a), forward<U>(b));;
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}
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template<typename T, typename U>
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inline constexpr bool operator==(const Pair<T, U> &x, const Pair<T, U> &y) {
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return (x.first == y.first) && (x.second == y.second);
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}
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template<typename T, typename U>
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inline constexpr bool operator!=(const Pair<T, U> &x, const Pair<T, U> &y) {
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return (x.first != y.first) || (x.second != y.second);
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}
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template<typename T, typename U>
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inline constexpr bool operator<(const Pair<T, U> &x, const Pair<T, U> &y) {
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return (x.first < y.first)
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? true
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: ((y.first < x.first)
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? false
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: ((x.second < y.second)
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? true
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: false));
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}
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template<typename T, typename U>
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inline constexpr bool operator>(const Pair<T, U> &x, const Pair<T, U> &y) {
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return (y < x);
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}
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template<typename T, typename U>
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inline constexpr bool operator<=(const Pair<T, U> &x, const Pair<T, U> &y) {
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return !(y < x);
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}
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template<typename T, typename U>
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inline constexpr bool operator>=(const Pair<T, U> &x, const Pair<T, U> &y) {
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return !(x < y);
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}
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template<typename T, typename U>
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constexpr Size TupleSize<Pair<T, U>> = 2;
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template<typename T, typename U>
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struct TupleElementBase<0, Pair<T, U>> {
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using Type = T;
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};
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template<typename T, typename U>
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struct TupleElementBase<1, Pair<T, U>> {
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using Type = U;
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};
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namespace detail {
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template<Size> struct GetPair;
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template<> struct GetPair<0> {
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template<typename T, typename U>
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static T &get(Pair<T, U> &p) { return p.first; }
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template<typename T, typename U>
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static const T &get(const Pair<T, U> &p) { return p.first; }
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template<typename T, typename U>
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static T &&get(Pair<T, U> &&p) { return forward<T>(p.first); }
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};
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template<> struct GetPair<1> {
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template<typename T, typename U>
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static U &get(Pair<T, U> &p) { return p.second; }
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template<typename T, typename U>
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static const U &get(const Pair<T, U> &p) { return p.second; }
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template<typename T, typename U>
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static U &&get(Pair<T, U> &&p) { return forward<U>(p.second); }
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};
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}
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template<Size I, typename T, typename U>
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TupleElement<I, Pair<T, U>> &get(Pair<T, U> &p) {
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return detail::GetPair<I>::get(p);
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}
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template<Size I, typename T, typename U>
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const TupleElement<I, Pair<T, U>> &get(const Pair<T, U> &p) {
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return detail::GetPair<I>::get(p);
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}
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template<Size I, typename T, typename U>
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TupleElement<I, Pair<T, U>> &&get(Pair<T, U> &&p) {
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return detail::GetPair<I>::get(move(p));
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}
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namespace detail {
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template<typename T, typename U,
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bool = IsSame<RemoveCv<T>, RemoveCv<U>>,
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bool = IsEmpty<T>, bool = IsEmpty<U>
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> constexpr Size CompressedPairSwitch = detail::Undefined<T>();
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/* neither empty */
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template<typename T, typename U, bool Same>
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constexpr Size CompressedPairSwitch<T, U, Same, false, false> = 0;
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/* first empty */
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template<typename T, typename U, bool Same>
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constexpr Size CompressedPairSwitch<T, U, Same, true, false> = 1;
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/* second empty */
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template<typename T, typename U, bool Same>
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constexpr Size CompressedPairSwitch<T, U, Same, false, true> = 2;
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/* both empty, not the same */
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template<typename T, typename U>
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constexpr Size CompressedPairSwitch<T, U, false, true, true> = 3;
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/* both empty and same */
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template<typename T, typename U>
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constexpr Size CompressedPairSwitch<T, U, true, true, true> = 1;
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template<typename T, typename U, Size = CompressedPairSwitch<T, U>>
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struct CompressedPairBase;
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template<typename T, typename U>
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struct CompressedPairBase<T, U, 0> {
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T p_first;
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U p_second;
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template<typename TT, typename UU>
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CompressedPairBase(TT &&a, UU &&b): p_first(forward<TT>(a)),
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p_second(forward<UU>(b)) {}
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T &first() { return p_first; }
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const T &first() const { return p_first; }
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U &second() { return p_second; }
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const U &second() const { return p_second; }
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void swap(CompressedPairBase &v) {
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swap_adl(p_first, v.p_first);
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swap_adl(p_second, v.p_second);
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}
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};
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template<typename T, typename U>
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struct CompressedPairBase<T, U, 1>: T {
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U p_second;
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template<typename TT, typename UU>
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CompressedPairBase(TT &&a, UU &&b): T(forward<TT>(a)),
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p_second(forward<UU>(b)) {}
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T &first() { return *this; }
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const T &first() const { return *this; }
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U &second() { return p_second; }
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const U &second() const { return p_second; }
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void swap(CompressedPairBase &v) {
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swap_adl(p_second, v.p_second);
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}
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};
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template<typename T, typename U>
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struct CompressedPairBase<T, U, 2>: U {
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T p_first;
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template<typename TT, typename UU>
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CompressedPairBase(TT &&a, UU &&b): U(forward<UU>(b)),
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p_first(forward<TT>(a)) {}
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T &first() { return p_first; }
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const T &first() const { return p_first; }
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U &second() { return *this; }
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const U &second() const { return *this; }
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void swap(CompressedPairBase &v) {
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swap_adl(p_first, v.p_first);
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}
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};
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template<typename T, typename U>
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struct CompressedPairBase<T, U, 3>: T, U {
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template<typename TT, typename UU>
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CompressedPairBase(TT &&a, UU &&b): T(forward<TT>(a)),
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U(forward<UU>(b)) {}
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T &first() { return *this; }
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const T &first() const { return *this; }
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U &second() { return *this; }
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const U &second() const { return *this; }
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void swap(CompressedPairBase &) {}
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};
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template<typename T, typename U>
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struct CompressedPair: CompressedPairBase<T, U> {
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using Base = CompressedPairBase<T, U>;
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template<typename TT, typename UU>
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CompressedPair(TT &&a, UU &&b): Base(forward<TT>(a),
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forward<UU>(b)) {}
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T &first() { return Base::first(); }
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const T &first() const { return Base::first(); }
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U &second() { return Base::second(); }
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const U &second() const { return Base::second(); }
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void swap(CompressedPair &v) {
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Base::swap(v);
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}
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};
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} /* namespace detail */
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} /* namespace ostd */
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#endif
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