67 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <array>10 11// const_reference operator[](size_type) const; // constexpr in C++1412// Libc++ marks it as noexcept13 14#include <array>15#include <cassert>16 17#include "test_macros.h"18 19TEST_CONSTEXPR_CXX14 bool tests() {20 {21 typedef double T;22 typedef std::array<T, 3> C;23 C const c = {1, 2, 3.5};24 LIBCPP_ASSERT_NOEXCEPT(c[0]);25 ASSERT_SAME_TYPE(C::const_reference, decltype(c[0]));26 C::const_reference r1 = c[0];27 assert(r1 == 1);28 C::const_reference r2 = c[2];29 assert(r2 == 3.5);30 }31 // Test operator[] "works" on zero sized arrays32 {33 {34 typedef double T;35 typedef std::array<T, 0> C;36 C const c = {};37 LIBCPP_ASSERT_NOEXCEPT(c[0]);38 ASSERT_SAME_TYPE(C::const_reference, decltype(c[0]));39 if (c.size() > (0)) { // always false40 C::const_reference r = c[0];41 (void)r;42 }43 }44 {45 typedef double T;46 typedef std::array<T const, 0> C;47 C const c = {};48 LIBCPP_ASSERT_NOEXCEPT(c[0]);49 ASSERT_SAME_TYPE(C::const_reference, decltype(c[0]));50 if (c.size() > (0)) { // always false51 C::const_reference r = c[0];52 (void)r;53 }54 }55 }56 57 return true;58}59 60int main(int, char**) {61 tests();62#if TEST_STD_VER >= 1463 static_assert(tests(), "");64#endif65 return 0;66}67