74 lines
1.3 KiB
C++
74 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <string>
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// void shrink_to_fit(); // constexpr since C++20
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#include "min_allocator.h"
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template <class S>
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TEST_CONSTEXPR_CXX20 void
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test(S s)
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{
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typename S::size_type old_cap = s.capacity();
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S s0 = s;
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s.shrink_to_fit();
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LIBCPP_ASSERT(s.__invariants());
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assert(s == s0);
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assert(s.capacity() <= old_cap);
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assert(s.capacity() >= s.size());
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}
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TEST_CONSTEXPR_CXX20 bool test() {
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{
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typedef std::string S;
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S s;
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test(s);
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s.assign(10, 'a');
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s.erase(5);
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test(s);
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s.assign(100, 'a');
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s.erase(50);
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test(s);
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}
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#if TEST_STD_VER >= 11
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{
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typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
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S s;
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test(s);
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s.assign(10, 'a');
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s.erase(5);
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test(s);
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s.assign(100, 'a');
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s.erase(50);
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test(s);
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}
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#endif
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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