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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
//
//===----------------------------------------------------------------------===//
// <string>
// void shrink_to_fit(); // constexpr since C++20
#include <string>
#include <cassert>
#include "test_macros.h"
#include "min_allocator.h"
#include "asan_testing.h"
template <class S>
TEST_CONSTEXPR_CXX20 void test(S s) {
typename S::size_type old_cap = s.capacity();
S s0 = s;
s.shrink_to_fit();
LIBCPP_ASSERT(s.__invariants());
assert(s == s0);
assert(s.capacity() <= old_cap);
assert(s.capacity() >= s.size());
LIBCPP_ASSERT(is_string_asan_correct(s));
}
template <class S>
TEST_CONSTEXPR_CXX20 void test_string() {
S s;
test(s);
s.assign(10, 'a');
s.erase(5);
test(s);
s.assign(50, 'a');
s.erase(5);
test(s);
s.assign(100, 'a');
s.erase(50);
test(s);
s.assign(100, 'a');
for (int i = 0; i <= 9; ++i) {
s.erase(90 - 10 * i);
test(s);
}
}
TEST_CONSTEXPR_CXX20 bool test() {
test_string<std::string>();
#if TEST_STD_VER >= 11
test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char>>>();
#endif
return true;
}
#if TEST_STD_VER >= 23
std::size_t min_bytes = 1000;
template <typename T>
struct increasing_allocator {
using value_type = T;
increasing_allocator() = default;
template <typename U>
increasing_allocator(const increasing_allocator<U>&) noexcept {}
std::allocation_result<T*> allocate_at_least(std::size_t n) {
std::size_t allocation_amount = n * sizeof(T);
if (allocation_amount < min_bytes)
allocation_amount = min_bytes;
min_bytes += 1000;
return {static_cast<T*>(::operator new(allocation_amount)), allocation_amount / sizeof(T)};
}
T* allocate(std::size_t n) { return allocate_at_least(n).ptr; }
void deallocate(T* p, std::size_t) noexcept { ::operator delete(static_cast<void*>(p)); }
};
template <typename T, typename U>
bool operator==(increasing_allocator<T>, increasing_allocator<U>) {
return true;
}
// https://github.com/llvm/llvm-project/issues/95161
void test_increasing_allocator() {
std::basic_string<char, std::char_traits<char>, increasing_allocator<char>> s{
"String does not fit in the internal buffer"};
std::size_t capacity = s.capacity();
std::size_t size = s.size();
s.shrink_to_fit();
assert(s.capacity() <= capacity);
assert(s.size() == size);
LIBCPP_ASSERT(is_string_asan_correct(s));
}
#endif // TEST_STD_VER >= 23
int main(int, char**) {
test();
#if TEST_STD_VER >= 23
test_increasing_allocator();
#endif
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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