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/* |
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* callback.h -- C++ callback mechanism |
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* Copyright (C) 2003-2018 Marc Lehmann <pcg@goof.com> |
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* |
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* This file is part of GVPE. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 3 of the License, or (at your |
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* option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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* Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, see <http://www.gnu.org/licenses/>. |
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* |
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* Additional permission under GNU GPL version 3 section 7 |
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* |
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* If you modify this Program, or any covered work, by linking or |
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* combining it with the OpenSSL project's OpenSSL library (or a modified |
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* version of that library), containing parts covered by the terms of the |
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* OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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* additional permission to convey the resulting work. Corresponding |
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* Source for a non-source form of such a combination shall include the |
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* source code for the parts of OpenSSL used as well as that of the |
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* covered work. |
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*/ |
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|
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#ifndef CALLBACK_H__ |
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#define CALLBACK_H__ |
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|
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#define CALLBACK_H_VERSION 4 |
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|
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template<typename signature> |
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struct callback; |
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|
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template<class R, class ...Args> |
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struct callback<R (Args...)> |
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{ |
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typedef R (*ptr_type)(void *self, Args...); |
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|
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template<class K, R (K::*method)(Args...)> |
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void set (K *object) |
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{ |
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self = object; |
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func = thunk<K, method>; |
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} |
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|
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R call (Args... args) const |
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{ |
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return func (self, args...); |
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} |
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|
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R operator ()(Args... args) const |
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{ |
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return call (args...); |
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} |
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|
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private: |
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|
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void *self; |
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ptr_type func; |
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|
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template<class klass, R (klass::*method)(Args...)> |
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static R thunk (void *self, Args... args) |
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{ |
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klass *obj = static_cast<klass *>(self); |
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return (obj->*method) (args...); |
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} |
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}; |
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|
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#endif |
