143 lines
4.4 KiB
C++
143 lines
4.4 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoFunctor.h
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// (c) Maarten Keijzer 2000
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/*
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Contact: todos@geneura.ugr.es, http://geneura.ugr.es
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mak@dhi.dk
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*/
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//-----------------------------------------------------------------------------
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#ifndef _eoFunctor_h
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#define _eoFunctor_h
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#include <functional>
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/// Base class for functors to get a nice hierarchy diagram
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class eoFunctorBase
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{
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public :
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virtual ~eoFunctorBase() {}
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/// tag to identify a procedure in compile time function selection @see functor_category
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struct procedure_tag {};
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/// tag to identify a unary function in compile time function selection @see functor_category
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struct unary_function_tag {};
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/// tag to identify a binary function in compile time function selection @see functor_category
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struct binary_function_tag {};
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};
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/**
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Basic Function. Derive from this class when defining
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any procedure. It defines a result_type that can be used
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to determine the return type
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Argument and result types can be any type including void for
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result_type
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**/
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template <class R>
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class eoF : public eoFunctorBase
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{
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public :
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/// virtual dtor here so there is no need to define it in derived classes
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virtual ~eoF() {}
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typedef R result_type;
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/// The pure virtual function that needs to be implemented by the subclass
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virtual R operator()() = 0;
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};
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/**
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Overloaded function that can help in the compile time detection
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of the type of functor we are dealing with
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@see eoCounter, make_counter
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*/
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template<class R>
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eoFunctorBase::procedure_tag functor_category(const eoF<R>&)
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{
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return eoFunctorBase::procedure_tag();
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}
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/**
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Basic Unary Functor. Derive from this class when defining
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any unary function. First template argument is the first_argument_type,
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second result_type.
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Argument and result types can be any type including void for
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result_type
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**/
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template <class A1, class R>
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class eoUF : public eoFunctorBase, public std::unary_function<A1, R>
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{
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public :
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/// virtual dtor here so there is no need to define it in derived classes
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virtual ~eoUF() {}
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/// The pure virtual function that needs to be implemented by the subclass
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virtual R operator()(A1) = 0;
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};
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/**
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Overloaded function that can help in the compile time detection
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of the type of functor we are dealing with
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@see eoCounter, make_counter
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*/
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template<class R, class A1>
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eoFunctorBase::unary_function_tag functor_category(const eoUF<A1, R>&)
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{
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return eoFunctorBase::unary_function_tag();
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}
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/**
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Basic Binary Functor. Derive from this class when defining
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any binary function. First template argument is result_type, second
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is first_argument_type, third is second_argument_type.
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Argument and result types can be any type including void for
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result_type
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**/
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template <class A1, class A2, class R>
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class eoBF : public eoFunctorBase, public std::binary_function<A1, A2, R>
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{
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public :
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/// virtual dtor here so there is no need to define it in derived classes
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virtual ~eoBF() {}
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//typedef R result_type;
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//typedef A1 first_argument_type;
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//typedef A2 second_argument_type;
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/// The pure virtual function that needs to be implemented by the subclass
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virtual R operator()(A1, A2) = 0;
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};
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/**
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Overloaded function that can help in the compile time detection
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of the type of functor we are dealing with
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@see eoCounter, make_counter
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*/
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template<class R, class A1, class A2>
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eoFunctorBase::binary_function_tag functor_category(const eoBF<A1, A2, R>&)
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{
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return eoFunctorBase::binary_function_tag();
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}
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#endif
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