Functionals.h

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/*
 * Copyright (C) 2012 by
 *   MetraLabs GmbH (MLAB), GERMANY
 * and
 *   Neuroinformatics and Cognitive Robotics Labs (NICR) at TU Ilmenau, GERMANY
 * All rights reserved.
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 * Contact: info@mira-project.org
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#ifndef _MIRA_FUNCTIONALS_H_
#define _MIRA_FUNCTIONALS_H_

#include <functional>
#include <iostream>

namespace mira {


namespace Private {

template <typename P, typename Op>
struct EvalFirstOf
{
    EvalFirstOf(const Op& iOp, const typename P::first_type& iValue) :
        op(iOp),
        value(iValue)
    {}

    bool operator()(const P& p)
    {
        return op(p.first, value);
    }

    Op op;
    typename P::first_type value;
};

template <typename P, typename Op>
struct EvalSecondOf
{
    EvalSecondOf(const Op& iOp, const typename P::second_type& iValue) :
        op(iOp),
        value(iValue) {}

    bool operator()(const P& p)
    {
        return op(p.second, value);
    }

    Op op;
    typename P::second_type value;
};

}   // namespace


template <typename P, typename Op>
Private::EvalFirstOf<P, Op> evalFirstOf(const Op& iOp, 
                                        const typename P::first_type& iValue)
{
    return Private::EvalFirstOf<P,Op>(iOp, iValue);
}

template <typename P, typename Op>
Private::EvalSecondOf<P, Op> evalSecondOf(const Op& iOp, 
                                          const typename P::second_type& iValue)
{
    return Private::EvalSecondOf<P,Op>(iOp, iValue);
}


}

#endif