forked from qt-creator/qt-creator
145 lines
3.9 KiB
C++
145 lines
3.9 KiB
C++
/**************************************************************************
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**
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** This file is part of Qt Creator
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**
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** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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**
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** Commercial Usage
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**
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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**
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** If you are unsure which license is appropriate for your use, please
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** contact the sales department at http://qt.nokia.com/contact.
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**
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**************************************************************************/
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#ifndef _TRK_FUNCTOR_H_
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#define _TRK_FUNCTOR_H_
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#include <QtGlobal>
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namespace trk {
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namespace Internal {
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/* Helper class for the 1-argument functor:
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* Cloneable base class for the implementation which is
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* invokeable with the argument. */
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template <class Argument>
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class TrkFunctor1ImplBase {
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Q_DISABLE_COPY(TrkFunctor1ImplBase)
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public:
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TrkFunctor1ImplBase() {}
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virtual TrkFunctor1ImplBase *clone() const = 0;
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virtual void invoke(Argument a) = 0;
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virtual ~TrkFunctor1ImplBase() {}
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};
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/* Helper class for the 1-argument functor: Implementation for
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* a class instance with a member function pointer. */
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template <class Klass, class Argument>
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class TrkFunctor1MemberPtrImpl : public TrkFunctor1ImplBase<Argument> {
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public:
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typedef void (Klass::*MemberFuncPtr)(Argument);
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explicit TrkFunctor1MemberPtrImpl(Klass *instance,
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MemberFuncPtr memberFunc) :
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m_instance(instance),
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m_memberFunc(memberFunc) {}
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virtual TrkFunctor1ImplBase<Argument> *clone() const
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{
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return new TrkFunctor1MemberPtrImpl<Klass, Argument>(m_instance, m_memberFunc);
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}
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virtual void invoke(Argument a)
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{ (m_instance->*m_memberFunc)(a); }
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private:
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Klass *m_instance;
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MemberFuncPtr m_memberFunc;
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};
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} // namespace Internal
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/* Default-constructible, copyable 1-argument functor providing an
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* operator()(Argument) that invokes a member function of a class:
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* \code
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class Foo {
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public:
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void print(const std::string &);
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};
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...
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Foo foo;
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TrkFunctor1<const std::string &> f1(&foo, &Foo::print);
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f1("test");
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\endcode */
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template <class Argument>
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class TrkFunctor1 {
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public:
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TrkFunctor1() : m_impl(0) {}
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template <class Klass>
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TrkFunctor1(Klass *instance,
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void (Klass::*memberFunc)(Argument)) :
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m_impl(new Internal::TrkFunctor1MemberPtrImpl<Klass,Argument>(instance, memberFunc)) {}
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~TrkFunctor1()
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{
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clean();
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}
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TrkFunctor1(const TrkFunctor1 &rhs) :
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m_impl(0)
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{
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if (rhs.m_impl)
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m_impl = rhs.m_impl->clone();
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}
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TrkFunctor1 &operator=(const TrkFunctor1 &rhs)
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{
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if (this != &rhs) {
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clean();
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if (rhs.m_impl)
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m_impl = rhs.m_impl->clone();
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}
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return *this;
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}
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inline bool isNull() const { return m_impl == 0; }
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operator bool() const { return !isNull(); }
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void operator()(Argument a)
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{
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if (m_impl)
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m_impl->invoke(a);
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}
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private:
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void clean()
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{
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if (m_impl) {
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delete m_impl;
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m_impl = 0;
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}
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}
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Internal::TrkFunctor1ImplBase<Argument> *m_impl;
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};
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} // namespace trk
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#endif // _TRK_FUNCTOR_H_
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