gecko-dev/mfbt/StandardInteger.h

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1.9 KiB
C
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/* -*- 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
2012-05-21 15:12:37 +04:00
* 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 the C99 <stdint.h> interface for C and C++ code. */
#ifndef mozilla_StandardInteger_h_
#define mozilla_StandardInteger_h_
/*
* The C99 standard header <stdint.h> exposes typedefs for common fixed-width
* integer types. It would be feasible to simply #include <stdint.h>, but
* MSVC++ versions prior to 2010 don't provide <stdint.h>. We could solve this
* by reimplementing <stdint.h> for MSVC++ 2008 and earlier. But then we reach
* a second problem: our custom <stdint.h> might conflict with a <stdint.h>
* defined by an embedder already looking to work around the MSVC++ <stdint.h>
* absence.
*
* We address these issues in this manner:
*
* 1. If the preprocessor macro MOZ_CUSTOM_STDINT_H is defined to a path to a
* custom <stdint.h> implementation, we will #include it. Embedders using
* a custom <stdint.h> must define this macro to an implementation that
* will work with their embedding.
* 2. Otherwise, if we are compiling with a an MSVC++ version without
* <stdint.h>, #include our custom <stdint.h> reimplementation.
* 3. Otherwise, #include the standard <stdint.h> provided by the compiler.
*
* Note that we can't call this file "stdint.h" or something case-insensitively
* equal to "stdint.h" because then MSVC (and other compilers on
* case-insensitive file systems) will include this file, rather than the system
* stdint.h, when we ask for <stdint.h> below.
*/
#if defined(MOZ_CUSTOM_STDINT_H)
# include MOZ_CUSTOM_STDINT_H
#elif defined(_MSC_VER) && _MSC_VER < 1600
# include "mozilla/MSStdInt.h"
#else
# include <stdint.h>
#endif
#endif /* mozilla_StandardInteger_h_ */