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// UNSUPPORTED: c++03, c++11, c++14, c++17
9
10// <string>
11
12// constexpr bool starts_with(const CharT *x) const;
13
14#include <string>
15#include <cassert>
16
17#include "test_macros.h"
18
19template <class S>
20constexpr void test_string() {
21 const char* s = "abcde";
22 S s0{};
23 S s1{s, 1};
24 S s2{s, 2};
25 // S s3 { s, 3 };
26 // S s4 { s, 4 };
27 // S s5 { s, 5 };
28 S sNot{"def", 3};
29
30 LIBCPP_ASSERT_NOEXCEPT(s0.starts_with(""));
31
32 assert(s0.starts_with(""));
33 assert(!s0.starts_with("a"));
34
35 assert(s1.starts_with(""));
36 assert(s1.starts_with("a"));
37 assert(!s1.starts_with("ab"));
38 assert(!s1.starts_with("abc"));
39 assert(!s1.starts_with("abcd"));
40 assert(!s1.starts_with("abcde"));
41 assert(!s1.starts_with("def"));
42
43 assert(s2.starts_with(""));
44 assert(s2.starts_with("a"));
45 assert(s2.starts_with("ab"));
46 assert(!s2.starts_with("abc"));
47 assert(!s2.starts_with("abcd"));
48 assert(!s2.starts_with("abcde"));
49 assert(!s2.starts_with("def"));
50
51 assert(sNot.starts_with(""));
52 assert(!sNot.starts_with("a"));
53 assert(!sNot.starts_with("ab"));
54 assert(!sNot.starts_with("abc"));
55 assert(!sNot.starts_with("abcd"));
56 assert(!sNot.starts_with("abcde"));
57 assert(sNot.starts_with("def"));
58}
59
60constexpr bool test() {
61 test_string<std::string>();
62
63 return true;
64}
65
66int main(int, char**) {
67 test();
68 static_assert(test());
69
70 return 0;
71}
72

source code of libcxx/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp