vctUnaryOperations.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-    */
/* ex: set filetype=cpp softtabstop=4 shiftwidth=4 tabstop=4 cindent expandtab: */

/*
  Author(s):  Ofri Sadowsky
  Created on: 2003-08-18

  (C) Copyright 2003-2014 Johns Hopkins University (JHU), All Rights Reserved.

--- begin cisst license - do not edit ---

This software is provided "as is" under an open source license, with
no warranty.  The complete license can be found in license.txt and
http://www.cisst.org/cisst/license.txt.

--- end cisst license ---
*/

#pragma once
#ifndef _vctUnaryOperations_h
#define _vctUnaryOperations_h

template<class _outputElementType, class _inputElementType = _outputElementType>
class vctUnaryOperations
{
    public:
    typedef _outputElementType OutputElementType;
    typedef _inputElementType InputElementType;

    class Identity {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(input);
        }
    };

    class AbsValue {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return (input > InputElementType(0)) ? OutputElementType(input) : OutputElementType(-input);
        }
    };

    class Floor {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType( floor((double)input) );
        }
    };

    class Ceil {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType( ceil((double)input) );
        }
    };



    class Square {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(input * input);
        }
    };

    class Negation {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(-input);
        }
    };

    class IsPositive {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(input > InputElementType(0));
        }
    };

    class IsNonNegative {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(input >= InputElementType(0));
        }
    };

    class IsNonPositive {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(input <= InputElementType(0));
        }
    };

    class IsNegative {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(input < InputElementType(0));
        }
    };

    class IsNonzero {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(input != InputElementType(0));
        }
    };

    class IsFinite {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(cmnTypeTraits<InputElementType>::IsFinite(input));
        }
    };

    class IsNaN {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(cmnTypeTraits<InputElementType>::IsNaN(input));
        }
    };

    /*    template<unsigned int EXPONENT>
    class Power {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            OutputElementType rootOfPower = Power<EXPONENT / 2>::OperationType(input);
            return ((EXPONENT % 2 == 0)
                    ? (rootOfPower * rootOfPower)
                    : (rootOfPower * rootOfPower * input));
        }
    };

    class Power<0> {
    public:
        static inline OutputElementType Operate(const InputElementType & input) {
            return OutputElementType(1);
        }
    };
    */
};


#endif  // _vctUnaryOperations_h