ToString.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.
 *
 * Contact: info@mira-project.org
 *
 * Commercial Usage:
 *   Licensees holding valid commercial licenses may use this file in
 *   accordance with the commercial license agreement provided with the
 *   software or, alternatively, in accordance with the terms contained in
 *   a written agreement between you and MLAB or NICR.
 *
 * GNU General Public License Usage:
 *   Alternatively, this file may be used under the terms of the GNU
 *   General Public License version 3.0 as published by the Free Software
 *   Foundation and appearing in the file LICENSE.GPL3 included in the
 *   packaging of this file. Please review the following information to
 *   ensure the GNU General Public License version 3.0 requirements will be
 *   met: http://www.gnu.org/copyleft/gpl.html.
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 * IN NO EVENT SHALL "MLAB" OR "NICR" BE LIABLE TO ANY PARTY FOR DIRECT,
 * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
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 */

#ifndef _MIRA_TOSTRING_H_
#define _MIRA_TOSTRING_H_

#include <boost/algorithm/string/predicate.hpp>

#include <error/Exceptions.h>

#include <math/Math.h>

#include <utils/FromToStringConstants.h>


namespace mira {


namespace Private {

template <typename T>
inline std::string genericToString(const T& value, int precision)
{
    std::stringstream ss;
    if(precision>=0)
        ss << std::setprecision(precision);
    ss << value;
    if(ss.fail())
        MIRA_THROW(XIO, "Failed to convert value into a string");
    return ss.str();
}

template <typename T>
inline std::string fpToString(const T& value, int precision)
{
    if(boost::math::isnan(value))
        return MIRA_TOSTRING_NAN;
    else if(boost::math::isinf(value)) {
        if(value>0)
            return MIRA_TOSTRING_POSITIVE_INF;
        else
            return MIRA_TOSTRING_NEGATIVE_INF;
    }
    else
        return genericToString<T>(value, precision);
}

template <typename T>
inline std::string charToString(const T& value)
{
    return genericToString<int>((int)value, 0);
}

} // Private


template <typename T>
class ToHex
{
public:
    ToHex(T v) : value(v) {}
    operator T() const { return value; }
    friend std::ostream& operator<<(std::ostream& oStream, const ToHex<T>& iValue)
    {
        oStream << std::hex << iValue.value;
        return oStream;
    }

    T value;
};

template <typename T>
class ToOct
{
public:
    ToOct(T v) : value(v) {}
    operator T() const { return value; }
    friend std::ostream& operator<<(std::ostream& oStream, const ToOct<T>& iValue)
    {
        oStream << std::oct << iValue.value;
        return oStream;
    }

    T value;
};


template <typename T>
std::string toString(const T& value, int precision=-1)
{
    return Private::genericToString<T>(value, precision);
}

template<>
inline std::string toString<char>(const char& value, int precision)
{
    return Private::charToString<char>(value);
}

template<>
inline std::string toString<signed char>(const signed char& value, 
                                         int precision)
{
    return Private::charToString<signed char>(value);
}

template<>
inline std::string toString<unsigned char>(const unsigned char& value, 
                                           int precision)
{
    return Private::charToString<unsigned char>(value);
}

template<>
inline std::string toString<std::string>(const std::string& value, 
                                         int precision)
{
    return value;
}

template<>
inline std::string toString<float>(const float& value, int precision)
{
    return Private::fpToString<float>(value, precision);
}

template<>
inline std::string toString<double>(const double& value, int precision)
{
    return Private::fpToString<double>(value, precision);
}

template<>
inline std::string toString<long double>(const long double& value, 
                                         int precision)
{
    return Private::fpToString<long double>(value, precision);
}

template<>
inline std::string toString<bool>(const bool& value, int precision)
{
    if ( value )
        return "true";
    else
        return "false";
}


} // namespace

#endif