include/ewalena/base/utilities.h

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// -------------------------------------------------------------------
// @author Toby D. Young
// @version $Id: utilities.h 993 2012-11-27 13:24:14Z oneliefleft $
//
// Copyright 2012 namespace ewalena authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above
//    copyright notice, this list of conditions and the following
//    disclaimer in the documentation and/or other materials provided
//    with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE NAMEPSACE EWALENA AUTHORS ``AS
// IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// NAMESPACE EWALENA AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and
// documentation are those of the authors and should not be
// interpreted as representing official policies, either expressed or
// implied, of the namespace ewalena authors.
// -------------------------------------------------------------------

#ifndef __ewalena_math_h
#define __ewalena_math_h

#ifdef EWALENA_HAVE_CONFIG_H
#include <ewalena/base/config.h>
#endif

#include <cassert>

namespace ewalena 
{
  
  namespace Math
  {

    template <typename ValueType>
      int sgn (const ValueType scalar);
    
    template <typename ValueType>
      ValueType incomplete_gamma (const ValueType scalar);
    
    unsigned int pow (const unsigned int x, 
                      const unsigned int y);
    
    bool is_odd (const int scalar);    
    
    bool is_even (const int scalar);    
    
  } /* namespace Math */
  
  namespace Value
  {
    static const double  PI      = 3.14159265358979323846;
    
    static const double  PI_2    = 1.57079632679489661923;
    
    static const double  PI_4    = 0.78539816339744830962;
    
    static const double  SQRTo2  = 1.41421356237309504880;
    
  }
  
} /* namespace ewalena */

#endif /* __ewalena_math_h */