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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: http://www.qt-project.org/
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**************************************************************************/
#ifndef DEBUGGER_CALLBACK_H
#define DEBUGGER_CALLBACK_H
#include "symbianutils_global.h"
namespace Coda {
namespace Internal {
/* Helper class for the 1-argument functor:
* Cloneable base class for the implementation which is
* invokeable with the argument. */
template <class Argument>
class CallbackImplBase
{
Q_DISABLE_COPY(CallbackImplBase)
public:
CallbackImplBase() {}
virtual CallbackImplBase *clone() const = 0;
virtual void invoke(Argument a) = 0;
virtual ~CallbackImplBase() {}
};
/* Helper class for the 1-argument functor: Implementation for
* a class instance with a member function pointer. */
template <class Class, class Argument>
class CallbackMemberPtrImpl : public CallbackImplBase<Argument>
{
public:
typedef void (Class::*MemberFuncPtr)(Argument);
CallbackMemberPtrImpl(Class *instance,
MemberFuncPtr memberFunc) :
m_instance(instance),
m_memberFunc(memberFunc) {}
virtual CallbackImplBase<Argument> *clone() const
{
return new CallbackMemberPtrImpl<Class, Argument>(m_instance, m_memberFunc);
}
virtual void invoke(Argument a)
{ (m_instance->*m_memberFunc)(a); }
private:
Class *m_instance;
MemberFuncPtr m_memberFunc;
};
} // namespace Internal
/* Default-constructible, copyable 1-argument functor providing an
* operator()(Argument) that invokes a member function of a class:
* \code
class Foo {
public:
void print(const std::string &);
};
...
Foo foo;
Callback<const std::string &> f1(&foo, &Foo::print);
f1("test");
\endcode */
template <class Argument>
class Callback
{
public:
Callback() : m_impl(0) {}
template <class Class>
Callback(Class *instance, void (Class::*memberFunc)(Argument)) :
m_impl(new Internal::CallbackMemberPtrImpl<Class,Argument>(instance, memberFunc))
{}
~Callback()
{
clean();
}
Callback(const Callback &rhs) :
m_impl(0)
{
if (rhs.m_impl)
m_impl = rhs.m_impl->clone();
}
Callback &operator=(const Callback &rhs)
{
if (this != &rhs) {
clean();
if (rhs.m_impl)
m_impl = rhs.m_impl->clone();
}
return *this;
}
bool isNull() const { return m_impl == 0; }
operator bool() const { return !isNull(); }
void operator()(Argument a)
{
if (m_impl)
m_impl->invoke(a);
}
private:
void clean()
{
if (m_impl) {
delete m_impl;
m_impl = 0;
}
}
Internal::CallbackImplBase<Argument> *m_impl;
};
} // namespace Coda
#endif // DEBUGGER_CALLBACK_H
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