NoExcept.h

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/*
 * Copyright (C) by
 *   MetraLabs GmbH (MLAB), GERMANY
 * and
 *   Neuroinformatics and Cognitive Robotics Labs (NICR) at TU Ilmenau, GERMANY
 * All rights reserved.
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 * Contact: info@mira-project.org
 *
 * Commercial Usage:
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 *   accordance with the commercial license agreement provided with the
 *   software or, alternatively, in accordance with the terms contained in
 *   a written agreement between you and MLAB or NICR.
 *
 * GNU General Public License Usage:
 *   Alternatively, this file may be used under the terms of the GNU
 *   General Public License version 3.0 as published by the Free Software
 *   Foundation and appearing in the file LICENSE.GPL3 included in the
 *   packaging of this file. Please review the following information to
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 */

#ifndef _MIRA_NOEXCEPT_H_
#define _MIRA_NOEXCEPT_H_

#include <platform/Platform.h>


// Note: noexcept and throw() is NOT exactly the same meaning!
//       See https://en.cppreference.com/w/cpp/language/noexcept_spec
//       "throw() - Non-throwing dynamic exception specification (unlike
//        noexcept(true) guarantees stack unwinding and may call std::unexpected)"
//
// However:
// - noexcept is not supported by older compilers
// - throw() is deprecated in C++ 17, removed in C++20
// --> using noexcept where supported and throw() otherwise seems the next best thing to do
//
// or just don't use it:
// https://akrzemi1.wordpress.com/2014/04/24/noexcept-what-for/


#ifdef BOOST_NOEXCEPT_OR_NOTHROW
    #define MIRA_NOEXCEPT_OR_NOTHROW BOOST_NOEXCEPT_OR_NOTHROW
#endif


// https://stackoverflow.com/questions/18387640/how-to-deal-with-noexcept-in-visual-studio
// https://gcc.gnu.org/gcc-4.6/changes.html

#ifndef MIRA_NOEXCEPT_OR_NOTHROW
    #if defined(MIRA_GNUC_VERSION)
        #if MIRA_GNUC_VERSION >= 40600
            #define MIRA_NOEXCEPT_OR_NOTHROW noexcept
        #else
            #define MIRA_NOEXCEPT_OR_NOTHROW throw()
        #endif
    #elif defined(_MSC_FULL_VER)
        #if _MSC_FULL_VER >= 190023026
            #define MIRA_NOEXCEPT_OR_NOTHROW noexcept
        #else
            #define MIRA_NOEXCEPT_OR_NOTHROW throw()
        #endif
    #elif defined(__clang__)
        #if __has_feature(cxx_noexcept)
            #define MIRA_NOEXCEPT_OR_NOTHROW noexcept
        #else
            #define MIRA_NOEXCEPT_OR_NOTHROW throw()
        #endif
    #else
        // for any unknown compiler just assume it supports noexcept
        #define MIRA_NOEXCEPT_OR_NOTHROW noexcept
    #endif
#endif


#endif