FunctionBinding.h

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/****************************************************************************/
// Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.dev/sumo
// Copyright (C) 2001-2024 German Aerospace Center (DLR) and others.
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0/
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License 2.0 are satisfied: GNU General Public License, version 2
// or later which is available at
// https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
/****************************************************************************/
//  Function type template
/****************************************************************************/
#pragma once
#include <config.h>
 
#include <utils/common/ValueSource.h>
#include "CastingFunctionBinding.h"
 
 
// ===========================================================================
// class definitions
// ===========================================================================
template< class T, typename R  >
class FunctionBinding : public ValueSource<R> {
public:
    typedef R(T::* Operation)() const;
 
    FunctionBinding(T* const source, Operation operation, const R scale = 1) :
        mySource(source),
        myOperation(operation),
        myScale(scale) {}
 
    ~FunctionBinding() {}
 
    R getValue() const {
        return myScale * (mySource->*myOperation)();
    }
 
    ValueSource<R>* copy() const {
        return new FunctionBinding<T, R>(mySource, myOperation, myScale);
    }
 
    ValueSource<double>* makedoubleReturningCopy() const {
        return new CastingFunctionBinding<T, double, R>(mySource, myOperation, myScale);
    }
 
private:
    T* mySource;
 
    Operation myOperation;
 
    const R myScale;
 
private:
    FunctionBinding<T, R>& operator=(const FunctionBinding<T, R>&);
 
};
 
template<class T>
class FunctionBindingString : public ValueSource<std::string> {
public:
    typedef std::string(T::* Operation)() const;
 
    FunctionBindingString(T* const source, Operation operation) :
        mySource(source),
        myOperation(operation)
    {}
 
    ~FunctionBindingString() {}
 
    std::string getValue() const {
        return (mySource->*myOperation)();
    }
 
    ValueSource<std::string>* copy() const {
        return new FunctionBindingString<T>(mySource, myOperation);
    }
 
    ValueSource<double>* makedoubleReturningCopy() const {
        return nullptr;
    }
 
private:
    T* mySource;
 
    Operation myOperation;
 
private:
    FunctionBindingString<T>& operator=(const FunctionBindingString<T>&);
 
};