mirror of
https://github.com/xiaoyifang/goldendict-ng.git
synced 2024-11-30 21:34:07 +00:00
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/** @file
|
|
* @brief Compiler attribute macros
|
|
*/
|
|
// Copyright (C) 2012,2013,2014,2015 Olly Betts
|
|
//
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
#ifndef XAPIAN_INCLUDED_ATTRIBUTES_H
|
|
#define XAPIAN_INCLUDED_ATTRIBUTES_H
|
|
|
|
#if __cplusplus >= 201103L || (defined _MSC_VER && _MSC_VER >= 1900)
|
|
// C++11 has noexcept for marking a function which shouldn't throw.
|
|
//
|
|
// You need a C++11 compiler to build Xapian, but we still support using a
|
|
// non-C++11 compiler to build code which uses Xapian (one reason is that
|
|
// currently you need an option to enable C++11 support for most
|
|
// compilers). Once we require C++11 for using Xapian, XAPIAN_NOTHROW can go
|
|
// away.
|
|
//
|
|
// We can't simply just add noexcept via XAPIAN_NOTHROW as noexcept has
|
|
// to be added to all declarations, whereas the GCC attribute can't be used on
|
|
// a function definition. So for now, XAPIAN_NOTHROW() goes around
|
|
// declarations, and XAPIAN_NOEXCEPT needs to be explicitly added to
|
|
// definitions.
|
|
# define XAPIAN_NOEXCEPT noexcept
|
|
#else
|
|
# define XAPIAN_NOEXCEPT
|
|
#endif
|
|
|
|
#ifdef __GNUC__
|
|
|
|
// __attribute__((__const__)) is available at least as far back as GCC 2.95.
|
|
# define XAPIAN_CONST_FUNCTION __attribute__((__const__))
|
|
// __attribute__((__pure__)) is available from GCC 2.96 onwards.
|
|
# define XAPIAN_PURE_FUNCTION __attribute__((__pure__))
|
|
// __attribute__((__nothrow__)) is available from GCC 3.3 onwards.
|
|
# if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
|
|
# define XAPIAN_NOTHROW(D) D XAPIAN_NOEXCEPT __attribute__((__nothrow__))
|
|
# endif
|
|
|
|
#else
|
|
|
|
/** A function which does not examine any values except its arguments and has
|
|
* no effects except its return value.
|
|
*
|
|
* This means the compiler can perform CSE (common subexpression elimination)
|
|
* on calls to such a function with the same arguments, and also completely
|
|
* eliminate calls to this function when the return value isn't used.
|
|
*/
|
|
# define XAPIAN_CONST_FUNCTION
|
|
|
|
/** Like XAPIAN_CONST_FUNCTION, but such a function can also examine global
|
|
* memory, perhaps via pointer or reference parameters.
|
|
*/
|
|
# define XAPIAN_PURE_FUNCTION
|
|
|
|
#endif
|
|
|
|
#ifndef XAPIAN_NOTHROW
|
|
/** A function or method which will never throw an exception. */
|
|
# define XAPIAN_NOTHROW(D) D XAPIAN_NOEXCEPT
|
|
#endif
|
|
|
|
#endif // XAPIAN_INCLUDED_ATTRIBUTES_H
|