test/std/strings/basic.string/string.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
//
//===----------------------------------------------------------------------===//

// <string>

// void shrink_to_fit();

#include <string>
#include <cassert>

#include "test_macros.h"
#include "min_allocator.h"

template <class S>
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());
}

int main(int, char**)
{
    {
    typedef std::string S;
    S s;
    test(s);

    s.assign(10, 'a');
    s.erase(5);
    test(s);

    s.assign(100, 'a');
    s.erase(50);
    test(s);
    }
#if TEST_STD_VER >= 11
    {
    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
    S s;
    test(s);

    s.assign(10, 'a');
    s.erase(5);
    test(s);

    s.assign(100, 'a');
    s.erase(50);
    test(s);
    }
#endif

  return 0;
}