forked from OctaForge/libostd
128 lines
3.1 KiB
C++
128 lines
3.1 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 OCTA_UTILITY_H
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#define OCTA_UTILITY_H
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#include <stddef.h>
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#include "octa/type_traits.h"
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namespace octa {
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/* move */
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template<typename T>
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static 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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static 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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static inline constexpr T &&forward(RemoveReference<T> &&v) {
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return static_cast<T &&>(v);
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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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template<typename T>
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struct __OctaSwapTest {
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template<typename U, void (U::*)(U &)> struct __OctaTest {};
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template<typename U> static char __octa_test(__OctaTest<U, &U::swap> *);
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template<typename U> static int __octa_test(...);
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static constexpr bool value = (sizeof(__octa_test<T>(0)) == sizeof(char));
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};
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template<typename T> inline void __octa_swap(T &a, T &b, EnableIf<
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__OctaSwapTest<T>::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 __octa_swap(T &a, T &b, EnableIf<
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!__OctaSwapTest<T>::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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template<typename T> void swap(T &a, T &b) {
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__octa_swap(a, b);
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}
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template<typename T, size_t N> void swap(T (&a)[N], T (&b)[N]) {
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for (size_t 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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/* 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): 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): 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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octa::swap(first, v.first);
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octa::swap(second, v.second);
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}
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};
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}
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#endif |