123 lines
2.9 KiB
C++
123 lines
2.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <array>
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// template <typename T, size_t Size>
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// constexpr auto to_array(T (&arr)[Size])
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// -> array<remove_cv_t<T>, Size>;
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// template <typename T, size_t Size>
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// constexpr auto to_array(T (&&arr)[Size])
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// -> array<remove_cv_t<T>, Size>;
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#include <array>
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#include <cassert>
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#include "test_macros.h"
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#include "MoveOnly.h"
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constexpr bool tests()
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{
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// Test deduced type.
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{
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auto arr = std::to_array({1, 2, 3});
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ASSERT_SAME_TYPE(decltype(arr), std::array<int, 3>);
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assert(arr[0] == 1);
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assert(arr[1] == 2);
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assert(arr[2] == 3);
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}
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{
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const long l1 = 42;
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auto arr = std::to_array({1L, 4L, 9L, l1});
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ASSERT_SAME_TYPE(decltype(arr)::value_type, long);
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static_assert(arr.size() == 4, "");
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assert(arr[0] == 1);
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assert(arr[1] == 4);
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assert(arr[2] == 9);
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assert(arr[3] == l1);
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}
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{
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auto arr = std::to_array("meow");
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ASSERT_SAME_TYPE(decltype(arr), std::array<char, 5>);
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assert(arr[0] == 'm');
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assert(arr[1] == 'e');
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assert(arr[2] == 'o');
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assert(arr[3] == 'w');
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assert(arr[4] == '\0');
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}
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{
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double source[3] = {4.0, 5.0, 6.0};
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auto arr = std::to_array(source);
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ASSERT_SAME_TYPE(decltype(arr), std::array<double, 3>);
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assert(arr[0] == 4.0);
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assert(arr[1] == 5.0);
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assert(arr[2] == 6.0);
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}
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{
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double source[3] = {4.0, 5.0, 6.0};
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auto arr = std::to_array(std::move(source));
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ASSERT_SAME_TYPE(decltype(arr), std::array<double, 3>);
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assert(arr[0] == 4.0);
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assert(arr[1] == 5.0);
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assert(arr[2] == 6.0);
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}
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{
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MoveOnly source[] = {MoveOnly{0}, MoveOnly{1}, MoveOnly{2}};
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auto arr = std::to_array(std::move(source));
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ASSERT_SAME_TYPE(decltype(arr), std::array<MoveOnly, 3>);
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for (int i = 0; i < 3; ++i)
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assert(arr[i].get() == i && source[i].get() == 0);
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}
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// Test C99 compound literal.
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{
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auto arr = std::to_array((int[]){3, 4});
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ASSERT_SAME_TYPE(decltype(arr), std::array<int, 2>);
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assert(arr[0] == 3);
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assert(arr[1] == 4);
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}
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// Test explicit type.
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{
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auto arr = std::to_array<long>({1, 2, 3});
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ASSERT_SAME_TYPE(decltype(arr), std::array<long, 3>);
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assert(arr[0] == 1);
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assert(arr[1] == 2);
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assert(arr[2] == 3);
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}
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{
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struct A {
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int a;
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double b;
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};
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auto arr = std::to_array<A>({{3, .1}});
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ASSERT_SAME_TYPE(decltype(arr), std::array<A, 1>);
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assert(arr[0].a == 3);
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assert(arr[0].b == .1);
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}
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return true;
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}
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int main(int, char**)
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{
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tests();
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static_assert(tests(), "");
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return 0;
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}
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