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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// std::ranges::ssize
#include <ranges>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
using RangeSSizeT = decltype(std::ranges::ssize);
static_assert(!std::is_invocable_v<RangeSSizeT, int[]>);
static_assert( std::is_invocable_v<RangeSSizeT, int[1]>);
static_assert( std::is_invocable_v<RangeSSizeT, int (&&)[1]>);
static_assert( std::is_invocable_v<RangeSSizeT, int (&)[1]>);
struct SizeMember {
constexpr std::size_t size() { return 42; }
};
static_assert(!std::is_invocable_v<decltype(std::ranges::ssize), const SizeMember&>);
struct SizeFunction {
friend constexpr std::size_t size(SizeFunction) { return 42; }
};
struct SizeFunctionSigned {
friend constexpr std::ptrdiff_t size(SizeFunctionSigned) { return 42; }
};
struct SizedSentinelRange {
int data_[2] = {};
constexpr int *begin() { return data_; }
constexpr auto end() { return sized_sentinel<int*>(data_ + 2); }
};
struct ShortUnsignedReturnType {
constexpr unsigned short size() { return 42; }
};
// size_t changes depending on the platform.
using SignedSizeT = std::make_signed_t<std::size_t>;
constexpr bool test() {
int a[4];
assert(std::ranges::ssize(a) == 4);
ASSERT_SAME_TYPE(decltype(std::ranges::ssize(a)), SignedSizeT);
assert(std::ranges::ssize(SizeMember()) == 42);
ASSERT_SAME_TYPE(decltype(std::ranges::ssize(SizeMember())), SignedSizeT);
assert(std::ranges::ssize(SizeFunction()) == 42);
ASSERT_SAME_TYPE(decltype(std::ranges::ssize(SizeFunction())), SignedSizeT);
assert(std::ranges::ssize(SizeFunctionSigned()) == 42);
ASSERT_SAME_TYPE(decltype(std::ranges::ssize(SizeFunctionSigned())), std::ptrdiff_t);
SizedSentinelRange b;
assert(std::ranges::ssize(b) == 2);
ASSERT_SAME_TYPE(decltype(std::ranges::ssize(b)), std::ptrdiff_t);
// This gets converted to ptrdiff_t because it's wider.
ShortUnsignedReturnType c;
assert(std::ranges::ssize(c) == 42);
ASSERT_SAME_TYPE(decltype(std::ranges::ssize(c)), std::ptrdiff_t);
return true;
}
// Test ADL-proofing.
struct Incomplete;
template<class T> struct Holder { T t; };
static_assert(!std::is_invocable_v<RangeSSizeT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeSSizeT, Holder<Incomplete>*&>);
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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