1/*
2 * Copyright (C) 2018 Yusuke Suzuki <utatane.tea@gmail.com>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28namespace WTF {
29
30class PrintStream;
31
32class ASCIILiteral {
33public:
34 operator const char*() const { return m_characters; }
35
36 static constexpr ASCIILiteral fromLiteralUnsafe(const char* string)
37 {
38 return ASCIILiteral { string };
39 }
40
41 WTF_EXPORT_PRIVATE void dump(PrintStream& out) const;
42
43 static constexpr ASCIILiteral null()
44 {
45 return ASCIILiteral { nullptr };
46 }
47
48 const char* characters() const { return m_characters; }
49
50private:
51 constexpr explicit ASCIILiteral(const char* characters) : m_characters(characters) { }
52
53 const char* m_characters;
54};
55
56inline namespace StringLiterals {
57
58constexpr ASCIILiteral operator"" _s(const char* characters, size_t)
59{
60 return ASCIILiteral::fromLiteralUnsafe(characters);
61}
62
63} // inline StringLiterals
64
65} // namespace WTF
66
67using namespace WTF::StringLiterals;
68using WTF::ASCIILiteral;
69