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.
87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <array>
|
|
|
|
// template <class T, size_t N> void swap(array<T,N>& x, array<T,N>& y);
|
|
|
|
#include <array>
|
|
#include <cassert>
|
|
|
|
#include "test_macros.h"
|
|
// std::array is explicitly allowed to be initialized with A a = { init-list };.
|
|
// Disable the missing braces warning for this reason.
|
|
#include "disable_missing_braces_warning.h"
|
|
|
|
struct NonSwappable {
|
|
NonSwappable() {}
|
|
private:
|
|
NonSwappable(NonSwappable const&);
|
|
NonSwappable& operator=(NonSwappable const&);
|
|
};
|
|
|
|
template <class Tp>
|
|
decltype(swap(std::declval<Tp>(), std::declval<Tp>()))
|
|
can_swap_imp(int);
|
|
|
|
template <class Tp>
|
|
std::false_type can_swap_imp(...);
|
|
|
|
template <class Tp>
|
|
struct can_swap : std::is_same<decltype(can_swap_imp<Tp>(0)), void> {};
|
|
|
|
int main(int, char**)
|
|
{
|
|
{
|
|
typedef double T;
|
|
typedef std::array<T, 3> C;
|
|
C c1 = {1, 2, 3.5};
|
|
C c2 = {4, 5, 6.5};
|
|
swap(c1, c2);
|
|
assert(c1.size() == 3);
|
|
assert(c1[0] == 4);
|
|
assert(c1[1] == 5);
|
|
assert(c1[2] == 6.5);
|
|
assert(c2.size() == 3);
|
|
assert(c2[0] == 1);
|
|
assert(c2[1] == 2);
|
|
assert(c2[2] == 3.5);
|
|
}
|
|
{
|
|
typedef double T;
|
|
typedef std::array<T, 0> C;
|
|
C c1 = {};
|
|
C c2 = {};
|
|
swap(c1, c2);
|
|
assert(c1.size() == 0);
|
|
assert(c2.size() == 0);
|
|
}
|
|
{
|
|
typedef NonSwappable T;
|
|
typedef std::array<T, 0> C0;
|
|
static_assert(can_swap<C0&>::value, "");
|
|
C0 l = {};
|
|
C0 r = {};
|
|
swap(l, r);
|
|
#if TEST_STD_VER >= 11
|
|
static_assert(noexcept(swap(l, r)), "");
|
|
#endif
|
|
}
|
|
#if TEST_STD_VER >= 11
|
|
{
|
|
// NonSwappable is still considered swappable in C++03 because there
|
|
// is no access control SFINAE.
|
|
typedef NonSwappable T;
|
|
typedef std::array<T, 42> C1;
|
|
static_assert(!can_swap<C1&>::value, "");
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|