attributes.h

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// 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
 
# define XAPIAN_CONST_FUNCTION
 
# define XAPIAN_PURE_FUNCTION
 
#endif
 
#ifndef XAPIAN_NOTHROW
# define XAPIAN_NOTHROW(D) D XAPIAN_NOEXCEPT
#endif
 
#endif // XAPIAN_INCLUDED_ATTRIBUTES_H