/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#ifndef itkIsNumber_h
#define itkIsNumber_h

#include "itkMetaProgrammingLibrary.h"
#include "itkIntTypes.h"

namespace itk
{
/// \cond HIDE_META_PROGRAMMING
namespace mpl
{
/** Tells whether a type is a number.
 * \return \c TrueType for all kinds of numbers from \c short to `long long`,
 * and from \c float to `long double`.
 * \ingroup MetaProgrammingLibrary
 * \ingroup ITKCommon
 */
template <typename T>
struct IsNumber : FalseType {};

/// \cond SPECIALIZATION_IMPLEMENTATION
template <> struct IsNumber<unsigned char>          : TrueType {};
template <> struct IsNumber<signed   char>          : TrueType {};
template <> struct IsNumber<unsigned short int>     : TrueType {};
template <> struct IsNumber<signed   short int>     : TrueType {};
template <> struct IsNumber<signed   int>           : TrueType {};
template <> struct IsNumber<unsigned int>           : TrueType {};
template <> struct IsNumber<signed   long int>      : TrueType {};
template <> struct IsNumber<unsigned long int>      : TrueType {};
template <> struct IsNumber<signed   long long int> : TrueType {};
template <> struct IsNumber<unsigned long long int> : TrueType {};
template <> struct IsNumber<float>                  : TrueType {};
template <> struct IsNumber<double>                 : TrueType {};
template <> struct IsNumber<long double>            : TrueType {};
/// \endcond

} // end namespace mpl
/// \endcond
} // end namespace itk

#endif // itkIsNumber_h
