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109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <array>
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// reference operator[] (size_type)
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// const_reference operator[] (size_type); // constexpr in C++14
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// reference at (size_type)
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// const_reference at (size_type); // constexpr in C++14
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#include <array>
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#include <cassert>
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#include "test_macros.h"
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// std::array is explicitly allowed to be initialized with A a = { init-list };.
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// Disable the missing braces warning for this reason.
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#include "disable_missing_braces_warning.h"
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#if TEST_STD_VER > 14
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constexpr bool check_idx( size_t idx, double val )
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{
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std::array<double, 3> arr = {1, 2, 3.5};
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return arr[idx] == val;
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}
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#endif
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int main()
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{
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{
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typedef double T;
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typedef std::array<T, 3> C;
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C c = {1, 2, 3.5};
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C::reference r1 = c[0];
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assert(r1 == 1);
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r1 = 5.5;
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assert(c.front() == 5.5);
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C::reference r2 = c[2];
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assert(r2 == 3.5);
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r2 = 7.5;
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assert(c.back() == 7.5);
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}
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{
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typedef double T;
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typedef std::array<T, 3> C;
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const C c = {1, 2, 3.5};
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C::const_reference r1 = c[0];
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assert(r1 == 1);
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C::const_reference r2 = c[2];
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assert(r2 == 3.5);
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}
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{ // Test operator[] "works" on zero sized arrays
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typedef double T;
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typedef std::array<T, 0> C;
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C c = {};
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C const& cc = c;
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static_assert((std::is_same<decltype(c[0]), T &>::value), "");
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static_assert((std::is_same<decltype(cc[0]), const T &>::value), "");
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if (c.size() > (0)) { // always false
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C::reference r1 = c[0];
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C::const_reference r2 = cc[0];
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((void)r1);
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((void)r2);
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}
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}
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{ // Test operator[] "works" on zero sized arrays
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typedef double T;
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typedef std::array<const T, 0> C;
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C c = {{}};
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C const& cc = c;
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static_assert((std::is_same<decltype(c[0]), const T &>::value), "");
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static_assert((std::is_same<decltype(cc[0]), const T &>::value), "");
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if (c.size() > (0)) { // always false
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C::reference r1 = c[0];
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C::const_reference r2 = cc[0];
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((void)r1);
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((void)r2);
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}
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}
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#if TEST_STD_VER > 11
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{
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typedef double T;
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typedef std::array<T, 3> C;
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constexpr C c = {1, 2, 3.5};
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constexpr T t1 = c[0];
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static_assert (t1 == 1, "");
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constexpr T t2 = c[2];
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static_assert (t2 == 3.5, "");
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}
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#endif
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#if TEST_STD_VER > 14
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{
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static_assert (check_idx(0, 1), "");
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static_assert (check_idx(1, 2), "");
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static_assert (check_idx(2, 3.5), "");
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}
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#endif
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}
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