forked from mirror/libcxx
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <utility>
|
|
|
|
// template<class T>
|
|
// requires MoveAssignable<T> && MoveConstructible<T>
|
|
// void
|
|
// swap(T& a, T& b);
|
|
|
|
#include <utility>
|
|
#include <cassert>
|
|
#include <memory>
|
|
|
|
#include "test_macros.h"
|
|
|
|
#if TEST_STD_VER >= 11
|
|
struct CopyOnly {
|
|
CopyOnly() {}
|
|
CopyOnly(CopyOnly const&) noexcept {}
|
|
CopyOnly& operator=(CopyOnly const&) { return *this; }
|
|
};
|
|
|
|
struct MoveOnly {
|
|
MoveOnly() {}
|
|
MoveOnly(MoveOnly&&) {}
|
|
MoveOnly& operator=(MoveOnly&&) noexcept { return *this; }
|
|
};
|
|
|
|
struct NoexceptMoveOnly {
|
|
NoexceptMoveOnly() {}
|
|
NoexceptMoveOnly(NoexceptMoveOnly&&) noexcept {}
|
|
NoexceptMoveOnly& operator=(NoexceptMoveOnly&&) noexcept { return *this; }
|
|
};
|
|
|
|
struct NotMoveConstructible {
|
|
NotMoveConstructible& operator=(NotMoveConstructible&&) { return *this; }
|
|
private:
|
|
NotMoveConstructible(NotMoveConstructible&&);
|
|
};
|
|
|
|
struct NotMoveAssignable {
|
|
NotMoveAssignable(NotMoveAssignable&&);
|
|
private:
|
|
NotMoveAssignable& operator=(NotMoveAssignable&&);
|
|
};
|
|
|
|
template <class Tp>
|
|
auto can_swap_test(int) -> decltype(std::swap(std::declval<Tp>(), std::declval<Tp>()));
|
|
|
|
template <class Tp>
|
|
auto can_swap_test(...) -> std::false_type;
|
|
|
|
template <class Tp>
|
|
constexpr bool can_swap() {
|
|
return std::is_same<decltype(can_swap_test<Tp>(0)), void>::value;
|
|
}
|
|
#endif
|
|
|
|
int main()
|
|
{
|
|
|
|
{
|
|
int i = 1;
|
|
int j = 2;
|
|
std::swap(i, j);
|
|
assert(i == 2);
|
|
assert(j == 1);
|
|
}
|
|
#if TEST_STD_VER >= 11
|
|
{
|
|
|
|
std::unique_ptr<int> i(new int(1));
|
|
std::unique_ptr<int> j(new int(2));
|
|
std::swap(i, j);
|
|
assert(*i == 2);
|
|
assert(*j == 1);
|
|
|
|
}
|
|
{
|
|
// test that the swap
|
|
static_assert(can_swap<CopyOnly&>(), "");
|
|
static_assert(can_swap<MoveOnly&>(), "");
|
|
static_assert(can_swap<NoexceptMoveOnly&>(), "");
|
|
|
|
static_assert(!can_swap<NotMoveConstructible&>(), "");
|
|
static_assert(!can_swap<NotMoveAssignable&>(), "");
|
|
|
|
CopyOnly c;
|
|
MoveOnly m;
|
|
NoexceptMoveOnly nm;
|
|
static_assert(!noexcept(std::swap(c, c)), "");
|
|
static_assert(!noexcept(std::swap(m, m)), "");
|
|
static_assert(noexcept(std::swap(nm, nm)), "");
|
|
}
|
|
#endif
|
|
}
|