75 lines
1.8 KiB
C++
75 lines
1.8 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>
|
||
|
|
|
||
|
|
// reference operator[](size_type); // constexpr in C++17
|
||
|
|
// Libc++ marks it as noexcept
|
||
|
|
|
||
|
|
#include <array>
|
||
|
|
#include <cassert>
|
||
|
|
|
||
|
|
#include "test_macros.h"
|
||
|
|
|
||
|
|
TEST_CONSTEXPR_CXX17 bool tests()
|
||
|
|
{
|
||
|
|
{
|
||
|
|
typedef double T;
|
||
|
|
typedef std::array<T, 3> C;
|
||
|
|
C c = {1, 2, 3.5};
|
||
|
|
LIBCPP_ASSERT_NOEXCEPT(c[0]);
|
||
|
|
ASSERT_SAME_TYPE(C::reference, decltype(c[0]));
|
||
|
|
C::reference r1 = c[0];
|
||
|
|
assert(r1 == 1);
|
||
|
|
r1 = 5.5;
|
||
|
|
assert(c.front() == 5.5);
|
||
|
|
|
||
|
|
C::reference r2 = c[2];
|
||
|
|
assert(r2 == 3.5);
|
||
|
|
r2 = 7.5;
|
||
|
|
assert(c.back() == 7.5);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Test operator[] "works" on zero sized arrays
|
||
|
|
{
|
||
|
|
{
|
||
|
|
typedef double T;
|
||
|
|
typedef std::array<T, 0> C;
|
||
|
|
C c = {};
|
||
|
|
LIBCPP_ASSERT_NOEXCEPT(c[0]);
|
||
|
|
ASSERT_SAME_TYPE(C::reference, decltype(c[0]));
|
||
|
|
if (c.size() > (0)) { // always false
|
||
|
|
C::reference r = c[0];
|
||
|
|
(void)r;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
{
|
||
|
|
typedef double T;
|
||
|
|
typedef std::array<const T, 0> C;
|
||
|
|
C c = {};
|
||
|
|
LIBCPP_ASSERT_NOEXCEPT(c[0]);
|
||
|
|
ASSERT_SAME_TYPE(C::reference, decltype(c[0]));
|
||
|
|
if (c.size() > (0)) { // always false
|
||
|
|
C::reference r = c[0];
|
||
|
|
(void)r;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int, char**)
|
||
|
|
{
|
||
|
|
tests();
|
||
|
|
#if TEST_STD_VER >= 17
|
||
|
|
static_assert(tests(), "");
|
||
|
|
#endif
|
||
|
|
return 0;
|
||
|
|
}
|