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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, c++20
// template<container-compatible-range<charT> R>
// constexpr basic_string(from_range_t, R&& rg, const Allocator& a = Allocator()); // since C++23
#include <algorithm>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#include "../../../containers/from_range_helpers.h"
#include "../../../containers/sequences/from_range_sequence_containers.h"
#include "test_macros.h"
#include "asan_testing.h"
template <class Container, class Range, class Alloc>
concept StringHasFromRangeAllocCtr =
requires(Range&& range, const Alloc& alloc) { Container(std::from_range, std::forward<Range>(range), alloc); };
constexpr bool test_constraints() {
// (from_range, range)
//
// Input range with the same value type.
static_assert(HasFromRangeCtr<std::string, InputRange<char>>);
// Input range with a convertible value type.
static_assert(HasFromRangeCtr<std::string, InputRange<int>>);
// Input range with a non-convertible value type.
static_assert(!HasFromRangeCtr<std::string, InputRange<Empty>>);
// Not an input range.
static_assert(!HasFromRangeCtr<std::string, InputRangeNotDerivedFrom>);
static_assert(!HasFromRangeCtr<std::string, InputRangeNotIndirectlyReadable>);
static_assert(!HasFromRangeCtr<std::string, InputRangeNotInputOrOutputIterator>);
// (from_range, range, alloc)
//
// Input range with the same value type.
using Alloc = test_allocator<char>;
using StringWithAlloc = std::basic_string<char, std::char_traits<char>, Alloc>;
static_assert(StringHasFromRangeAllocCtr<StringWithAlloc, InputRange<char>, Alloc>);
// Input range with a convertible value type.
static_assert(StringHasFromRangeAllocCtr<StringWithAlloc, InputRange<int>, Alloc>);
// Input range with a non-convertible value type.
static_assert(!StringHasFromRangeAllocCtr<StringWithAlloc, InputRange<Empty>, Alloc>);
// Not an input range.
static_assert(!StringHasFromRangeAllocCtr<StringWithAlloc, InputRangeNotDerivedFrom, Alloc>);
static_assert(!StringHasFromRangeAllocCtr<StringWithAlloc, InputRangeNotIndirectlyReadable, Alloc>);
static_assert(!StringHasFromRangeAllocCtr<StringWithAlloc, InputRangeNotInputOrOutputIterator, Alloc>);
// Not an allocator.
static_assert(!StringHasFromRangeAllocCtr<StringWithAlloc, InputRange<char>, Empty>);
return true;
}
template <class Iter, class Sent, class Alloc>
constexpr void test_with_input(std::vector<char> input) {
{ // (range)
std::ranges::subrange in(Iter(input.data()), Sent(Iter(input.data() + input.size())));
std::string c(std::from_range, in);
LIBCPP_ASSERT(c.__invariants());
assert(c.size() == static_cast<std::size_t>(std::distance(c.begin(), c.end())));
assert(std::ranges::equal(input, c));
LIBCPP_ASSERT(is_string_asan_correct(c));
}
{ // (range, allocator)
std::ranges::subrange in(Iter(input.data()), Sent(Iter(input.data() + input.size())));
Alloc alloc;
std::basic_string<char, std::char_traits<char>, Alloc> c(std::from_range, in, alloc);
LIBCPP_ASSERT(c.__invariants());
assert(c.get_allocator() == alloc);
assert(c.size() == static_cast<std::size_t>(std::distance(c.begin(), c.end())));
assert(std::ranges::equal(input, c));
LIBCPP_ASSERT(is_string_asan_correct(c));
}
{ // Ensure input-only sized ranges are accepted.
using input_iter = cpp20_input_iterator<const char*>;
const char in[]{'q', 'w', 'e', 'r'};
std::string s(std::from_range, std::views::counted(input_iter{std::ranges::begin(in)}, std::ranges::ssize(in)));
assert(s == "qwer");
}
}
void test_string_exception_safety_throwing_allocator() {
#if !defined(TEST_HAS_NO_EXCEPTIONS)
try {
ThrowingAllocator<char> alloc;
globalMemCounter.reset();
// Note: the input string must be long enough to prevent SSO, otherwise the allocator won't be used.
std::basic_string<char, std::char_traits<char>, ThrowingAllocator<char>> c(
std::from_range, std::vector<char>(64, 'A'), alloc);
assert(false); // The constructor call should throw.
} catch (int) {
assert(globalMemCounter.new_called == globalMemCounter.delete_called);
}
#endif
}
constexpr bool test_inputs() {
for_all_iterators_and_allocators<char>([]<class Iter, class Sent, class Alloc>() {
// Shorter input -- SSO.
test_with_input<Iter, Sent, Alloc>({'a', 'b', 'c', 'd', 'e'});
// Longer input -- no SSO.
test_with_input<Iter, Sent, Alloc>(std::vector<char>(64, 'A'));
// Empty input.
test_with_input<Iter, Sent, Alloc>({});
// Single-element input.
test_with_input<Iter, Sent, Alloc>({'a'});
});
return true;
}
#ifndef TEST_HAS_NO_LOCALIZATION
void test_counted_istream_view() {
std::istringstream is{"qwert"};
auto vals = std::views::istream<char>(is);
std::string s(std::from_range, std::views::counted(vals.begin(), 3));
assert(s == "qwe");
}
#endif
int main(int, char**) {
test_inputs();
static_assert(test_inputs());
static_assert(test_constraints());
// Note: `test_exception_safety_throwing_copy` doesn't apply because copying a `char` cannot throw.
test_string_exception_safety_throwing_allocator();
#ifndef TEST_HAS_NO_LOCALIZATION
test_counted_istream_view();
#endif
return 0;
}
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