70 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// REQUIRES: std-at-least-c++2010 11// [range.access.general]/1:12// In addition to being available via inclusion of the <ranges> header, the customization point objects in13// [range.access] are available when the header <iterator> is included.14 15#include <iterator>16#include <type_traits>17 18#include "test_macros.h"19 20template <class CPO, class... Args>21constexpr void test(CPO& o, Args&&... args) {22 static_assert(std::is_const_v<CPO>);23 static_assert(std::is_class_v<CPO>);24 static_assert(std::is_trivially_copyable_v<CPO>);25 static_assert(std::is_trivially_default_constructible_v<CPO>);26 27 auto p = o;28 using T = decltype(p);29 (void)o(args...); // to make sure the CPO can actually be used30 31 // The type of a customization point object, ignoring cv-qualifiers, shall model semiregular.32 static_assert(std::semiregular<T>);33 34 // The type T of a customization point object, ignoring cv-qualifiers, shall model...35 static_assert(std::invocable<T&, Args...>);36 static_assert(std::invocable<const T&, Args...>);37 static_assert(std::invocable<T, Args...>);38 static_assert(std::invocable<const T, Args...>);39}40 41int a[10];42 43constexpr bool test() {44 test(std::ranges::begin, a);45 test(std::ranges::end, a);46 test(std::ranges::cbegin, a);47 test(std::ranges::cdata, a);48 test(std::ranges::cend, a);49 test(std::ranges::crbegin, a);50 test(std::ranges::crend, a);51 test(std::ranges::data, a);52 test(std::ranges::empty, a);53 test(std::ranges::rbegin, a);54 test(std::ranges::rend, a);55 test(std::ranges::size, a);56 test(std::ranges::ssize, a);57 58#if TEST_STD_VER >= 2659 // test(std::views::reserve_hint, a);60#endif61 62 return true;63}64 65int main(int, char**) {66 test();67 static_assert(test());68 return 0;69}70