/usr/include/mozjs-24/mozilla/Char16.h is in libmozjs-24-dev 24.2.0-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* Implements a UTF-16 character type. */
#ifndef mozilla_Char16_h_
#define mozilla_Char16_h_
#include "mozilla/Assertions.h"
/*
* C11 and C++11 introduce a char16_t type and support for UTF-16 string and
* character literals. C++11's char16_t is a distinct builtin type. C11's
* char16_t is a typedef for uint_least16_t. Technically, char16_t is a 16-bit
* code unit of a Unicode code point, not a "character".
*
* For now, Char16.h only supports C++ because we don't want mix different C
* and C++ definitions of char16_t in the same code base.
*/
#ifdef _MSC_VER
/*
* C++11 says char16_t is a distinct builtin type, but Windows's yvals.h
* typedefs char16_t as an unsigned short. We would like to alias char16_t
* to Windows's 16-bit wchar_t so we can declare UTF-16 literals as constant
* expressions (and pass char16_t pointers to Windows APIs). We #define our
* char16_t as a macro to override yval.h's typedef of the same name.
*/
# define MOZ_UTF16_HELPER(s) L##s
# include <yvals.h>
# define char16_t wchar_t
#elif defined(__cplusplus) && \
(__cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__))
/* C++11 has a builtin char16_t type. */
# define MOZ_UTF16_HELPER(s) u##s
#else
# error "Char16.h requires C++11 (or something like it) for UTF-16 support."
#endif
/*
* Macro arguments used in concatenation or stringification won't be expanded.
* Therefore, in order for |MOZ_UTF16(FOO)| to work as expected (which is to
* expand |FOO| before doing whatever |MOZ_UTF16| needs to do to it) a helper
* macro, |MOZ_UTF16_HELPER| needs to be inserted in between to allow the macro
* argument to expand. See "3.10.6 Separate Expansion of Macro Arguments" of the
* CPP manual for a more accurate and precise explanation.
*/
#define MOZ_UTF16(s) MOZ_UTF16_HELPER(s)
MOZ_STATIC_ASSERT(sizeof(char16_t) == 2, "Is char16_t type 16 bits?");
MOZ_STATIC_ASSERT(sizeof(MOZ_UTF16('A')) == 2, "Is char literal 16 bits?");
MOZ_STATIC_ASSERT(sizeof(MOZ_UTF16("")[0]) == 2, "Is string char 16 bits?");
#endif /* mozilla_Char16_h_ */
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