96 lines
2.8 KiB
C++
96 lines
2.8 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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// UNSUPPORTED: gcc-10
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// std::ranges::ssize
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#include <ranges>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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using RangeSSizeT = decltype(std::ranges::ssize);
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static_assert(!std::is_invocable_v<RangeSSizeT, int[]>);
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static_assert( std::is_invocable_v<RangeSSizeT, int[1]>);
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static_assert( std::is_invocable_v<RangeSSizeT, int (&&)[1]>);
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static_assert( std::is_invocable_v<RangeSSizeT, int (&)[1]>);
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static_assert(std::semiregular<std::remove_cv_t<RangeSSizeT>>);
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struct SizeMember {
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constexpr size_t size() { return 42; }
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};
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static_assert(!std::is_invocable_v<RangeSSizeT, const SizeMember>);
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struct SizeFunction {
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friend constexpr size_t size(SizeFunction) { return 42; }
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};
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struct SizeFunctionSigned {
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friend constexpr std::ptrdiff_t size(SizeFunctionSigned) { return 42; }
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};
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struct sentinel {
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bool operator==(std::input_or_output_iterator auto) const { return true; }
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};
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struct RandomAccesslRange {
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constexpr random_access_iterator<int*> begin() { return {}; }
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constexpr sentinel end() { return {}; }
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};
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constexpr std::ptrdiff_t operator-(const sentinel, const random_access_iterator<int*>) { return 2; }
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constexpr std::ptrdiff_t operator-(const random_access_iterator<int*>, const sentinel) { return 2; }
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struct ShortUnsignedReturnType {
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constexpr unsigned short size() { return 42; }
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};
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// size_t changes depending on the platform.
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using SignedSizeT = std::make_signed_t<size_t>;
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constexpr bool test() {
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int a[4];
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assert(std::ranges::ssize(a) == 4);
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ASSERT_SAME_TYPE(decltype(std::ranges::ssize(a)), SignedSizeT);
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assert(std::ranges::ssize(SizeMember()) == 42);
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ASSERT_SAME_TYPE(decltype(std::ranges::ssize(SizeMember())), SignedSizeT);
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assert(std::ranges::ssize(SizeFunction()) == 42);
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ASSERT_SAME_TYPE(decltype(std::ranges::ssize(SizeFunction())), SignedSizeT);
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assert(std::ranges::ssize(SizeFunctionSigned()) == 42);
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ASSERT_SAME_TYPE(decltype(std::ranges::ssize(SizeFunctionSigned())), std::ptrdiff_t);
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RandomAccesslRange b;
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assert(std::ranges::ssize(b) == 2);
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ASSERT_SAME_TYPE(decltype(std::ranges::ssize(b)), std::ptrdiff_t);
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// This gets converted to ptrdiff_t because it's wider.
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ShortUnsignedReturnType c;
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assert(std::ranges::ssize(c) == 42);
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ASSERT_SAME_TYPE(decltype(std::ranges::ssize(c)), ptrdiff_t);
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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