77 lines
2.2 KiB
C++
77 lines
2.2 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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <string>
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// template <class charT, class traits, class Allocator, class U>
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// typename basic_string<charT, traits, Allocator>::size_type
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// erase(basic_string<charT, traits, Allocator>& c, const U& value);
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#include <string>
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#include <optional>
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#include "test_macros.h"
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#include "test_allocator.h"
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#include "min_allocator.h"
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template <class S, class U>
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void test0(S s, U val, S expected, size_t expected_erased_count) {
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ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
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assert(expected_erased_count == std::erase(s, val));
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LIBCPP_ASSERT(s.__invariants());
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assert(s == expected);
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}
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template <class S>
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void test()
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{
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test0(S(""), 'a', S(""), 0);
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test0(S("a"), 'a', S(""), 1);
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test0(S("a"), 'b', S("a"), 0);
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test0(S("ab"), 'a', S("b"), 1);
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test0(S("ab"), 'b', S("a"), 1);
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test0(S("ab"), 'c', S("ab"), 0);
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test0(S("aa"), 'a', S(""), 2);
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test0(S("aa"), 'c', S("aa"), 0);
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test0(S("abc"), 'a', S("bc"), 1);
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test0(S("abc"), 'b', S("ac"), 1);
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test0(S("abc"), 'c', S("ab"), 1);
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test0(S("abc"), 'd', S("abc"), 0);
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test0(S("aab"), 'a', S("b"), 2);
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test0(S("aab"), 'b', S("aa"), 1);
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test0(S("aab"), 'c', S("aab"), 0);
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test0(S("abb"), 'a', S("bb"), 1);
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test0(S("abb"), 'b', S("a"), 2);
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test0(S("abb"), 'c', S("abb"), 0);
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test0(S("aaa"), 'a', S(""), 3);
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test0(S("aaa"), 'b', S("aaa"), 0);
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// Test cross-type erasure
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using opt = std::optional<typename S::value_type>;
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test0(S("aba"), opt(), S("aba"), 0);
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test0(S("aba"), opt('a'), S("b"), 2);
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test0(S("aba"), opt('b'), S("aa"), 1);
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test0(S("aba"), opt('c'), S("aba"), 0);
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}
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int main(int, char**)
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{
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test<std::string>();
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test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>> ();
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test<std::basic_string<char, std::char_traits<char>, test_allocator<char>>> ();
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return 0;
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}
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