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instance_callback.h
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100 lines (80 loc) · 2.68 KB
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/*
Copyright (c) 2014, 2016 Oracle and/or its affiliates. All rights reserved.
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; version 2 of the License.
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 INSTANCE_CALLBACK_INCLUDED
#define INSTANCE_CALLBACK_INCLUDED
#include "i_callable.h"
#include <cstddef> // NULL
namespace Mysql{
/**
Instance method based callback.
*/
template<typename T_result, typename T_arg, typename T_class>
class Instance_callback : public I_callable<T_result, T_arg>
{
typedef T_result (T_class::*Method)(T_arg);
public:
/**
Creates new instance method callback.
*/
Instance_callback(T_class* instance, Method method);
/**
Invokes callback method on instance specified in constructor.
*/
T_result operator()(T_arg argument) const;
protected:
T_class* m_instance;
private:
Method m_method;
};
/**
Instance method based callback. Owns T_class instance and destroys it when it
dies.
*/
template<typename T_result, typename T_arg, typename T_class>
class Instance_callback_own
: public Instance_callback<T_result, T_arg, T_class>
{
typedef T_result (T_class::*Method)(T_arg);
public:
/**
Creates new instance method callback.
*/
Instance_callback_own(T_class* instance, Method method);
~Instance_callback_own();
};
template<typename T_result, typename T_arg, typename T_class>
Instance_callback<T_result, T_arg, T_class>::
Instance_callback(T_class* instance, Method method)
: m_instance(instance), m_method(method)
{}
template<typename T_result, typename T_arg, typename T_class>
T_result Instance_callback<T_result, T_arg, T_class>::operator()
(T_arg argument) const
{
return (this->m_instance->*this->m_method)(argument);
}
template<typename T_result, typename T_arg, typename T_class>
Instance_callback_own<T_result, T_arg, T_class>::
Instance_callback_own(T_class* instance, Method method)
: Instance_callback<T_result, T_arg, T_class>(instance, method)
{}
template<typename T_result, typename T_arg, typename T_class>
Instance_callback_own<T_result, T_arg, T_class>::
~Instance_callback_own()
{
delete this->m_instance;
this->m_instance= NULL;
}
}
#endif