1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14, c++17
10
11 // <string>
12
13 // template <class charT, class traits, class Allocator, class U>
14 // typename basic_string<charT, traits, Allocator>::size_type
15 // erase(basic_string<charT, traits, Allocator>& c, const U& value);
16
17 #include <string>
18 #include <optional>
19
20 #include "test_macros.h"
21 #include "test_allocator.h"
22 #include "min_allocator.h"
23
24 template <class S, class U>
test0(S s,U val,S expected,std::size_t expected_erased_count)25 void test0(S s, U val, S expected, std::size_t expected_erased_count) {
26 ASSERT_SAME_TYPE(typename S::size_type, decltype(std::erase(s, val)));
27 assert(expected_erased_count == std::erase(s, val));
28 LIBCPP_ASSERT(s.__invariants());
29 assert(s == expected);
30 }
31
32 template <class S>
test()33 void test() {
34 test0(S(""), 'a', S(""), 0);
35
36 test0(S("a"), 'a', S(""), 1);
37 test0(S("a"), 'b', S("a"), 0);
38
39 test0(S("ab"), 'a', S("b"), 1);
40 test0(S("ab"), 'b', S("a"), 1);
41 test0(S("ab"), 'c', S("ab"), 0);
42 test0(S("aa"), 'a', S(""), 2);
43 test0(S("aa"), 'c', S("aa"), 0);
44
45 test0(S("abc"), 'a', S("bc"), 1);
46 test0(S("abc"), 'b', S("ac"), 1);
47 test0(S("abc"), 'c', S("ab"), 1);
48 test0(S("abc"), 'd', S("abc"), 0);
49
50 test0(S("aab"), 'a', S("b"), 2);
51 test0(S("aab"), 'b', S("aa"), 1);
52 test0(S("aab"), 'c', S("aab"), 0);
53 test0(S("abb"), 'a', S("bb"), 1);
54 test0(S("abb"), 'b', S("a"), 2);
55 test0(S("abb"), 'c', S("abb"), 0);
56 test0(S("aaa"), 'a', S(""), 3);
57 test0(S("aaa"), 'b', S("aaa"), 0);
58
59 // Test cross-type erasure
60 using opt = std::optional<typename S::value_type>;
61 test0(S("aba"), opt(), S("aba"), 0);
62 test0(S("aba"), opt('a'), S("b"), 2);
63 test0(S("aba"), opt('b'), S("aa"), 1);
64 test0(S("aba"), opt('c'), S("aba"), 0);
65 }
66
main(int,char **)67 int main(int, char**) {
68 test<std::string>();
69 test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
70 test<std::basic_string<char, std::char_traits<char>, test_allocator<char>>>();
71
72 return 0;
73 }
74