xref: /llvm-project-15.0.7/libcxx/test/std/strings/basic.string/string.capacity/reserve.pass.cpp (revision e85018b7)

//===----------------------------------------------------------------------===//
//
// 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 reserve(); // Deprecated in C++20.

// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS

#include <string>
#include <stdexcept>
#include <cassert>

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

template <class S>
TEST_CONSTEXPR_CXX20 void
test(typename S::size_type min_cap, typename S::size_type erased_index)
{
    S s(min_cap, 'a');
    s.erase(erased_index);
    assert(s.size() == erased_index);
    assert(s.capacity() >= min_cap); // Check that we really have at least this capacity.

    typename S::size_type old_cap = s.capacity();
    S s0 = s;
    s.reserve();
    LIBCPP_ASSERT(s.__invariants());
    assert(s == s0);
    assert(s.capacity() <= old_cap);
    assert(s.capacity() >= s.size());
}

bool test() {
    {
    typedef std::string S;
    {
    test<S>(0, 0);
    test<S>(10, 5);
    test<S>(100, 50);
    }
    }
#if TEST_STD_VER >= 11
    {
    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
    {
    test<S>(0, 0);
    test<S>(10, 5);
    test<S>(100, 50);
    }
    }
#endif

  return true;
}

int main(int, char**)
{
  test();
#if TEST_STD_VER > 17
  // static_assert(test());
#endif

  return 0;
}