third_party/llvm-project/libcxx/test/std/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <vector>

// void shrink_to_fit();

#include <vector>
#include <cassert>
#include "test_macros.h"
#include "test_allocator.h"
#include "min_allocator.h"
#include "asan_testing.h"

TEST_CONSTEXPR_CXX20 bool tests() {
    {
        std::vector<int> v(100);
        v.push_back(1);
        assert(is_contiguous_container_asan_correct(v));
        v.shrink_to_fit();
        assert(v.capacity() == 101);
        assert(v.size() == 101);
        assert(is_contiguous_container_asan_correct(v));
    }
    {
        std::vector<int, limited_allocator<int, 401> > v(100);
        v.push_back(1);
        assert(is_contiguous_container_asan_correct(v));
        v.shrink_to_fit();
        assert(v.capacity() == 101);
        assert(v.size() == 101);
        assert(is_contiguous_container_asan_correct(v));
    }
#ifndef TEST_HAS_NO_EXCEPTIONS
    if (!TEST_IS_CONSTANT_EVALUATED) {
        std::vector<int, limited_allocator<int, 400> > v(100);
        v.push_back(1);
        assert(is_contiguous_container_asan_correct(v));
        v.shrink_to_fit();
        LIBCPP_ASSERT(v.capacity() == 200); // assumes libc++'s 2x growth factor
        assert(v.size() == 101);
        assert(is_contiguous_container_asan_correct(v));
    }
#endif
#if TEST_STD_VER >= 11
    {
        std::vector<int, min_allocator<int>> v(100);
        v.push_back(1);
        assert(is_contiguous_container_asan_correct(v));
        v.shrink_to_fit();
        assert(v.capacity() == 101);
        assert(v.size() == 101);
        assert(is_contiguous_container_asan_correct(v));
    }
    {
      std::vector<int, safe_allocator<int>> v(100);
      v.push_back(1);
      assert(is_contiguous_container_asan_correct(v));
      v.shrink_to_fit();
      assert(v.capacity() == 101);
      assert(v.size() == 101);
      assert(is_contiguous_container_asan_correct(v));
    }
#endif

    return true;
}

int main(int, char**)
{
    tests();
#if TEST_STD_VER > 17
    static_assert(tests());
#endif
    return 0;
}