ITK  4.1.0
Insight Segmentation and Registration Toolkit
itkIsSame.h
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00001  /*=========================================================================
00002  *
00003  *  Copyright Insight Software Consortium
00004  *
00005  *  Licensed under the Apache License, Version 2.0 (the "License");
00006  *  you may not use this file except in compliance with the License.
00007  *  You may obtain a copy of the License at
00008  *
00009  *         http://www.apache.org/licenses/LICENSE-2.0.txt
00010  *
00011  *  Unless required by applicable law or agreed to in writing, software
00012  *  distributed under the License is distributed on an "AS IS" BASIS,
00013  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  *  See the License for the specific language governing permissions and
00015  *  limitations under the License.
00016  *
00017  *=========================================================================*/
00018 #ifndef __itkIsSame_h
00019 #define __itkIsSame_h
00020 
00021 namespace itk
00022 {
00023 
00027   struct TrueType
00028   {
00029     typedef bool     ValueType;
00030     typedef TrueType Type;
00031 
00032     static const ValueType Value = true;
00033     operator ValueType() { return Value; }
00034   };
00035 
00036   struct FalseType
00037   {
00038     typedef bool      ValueType;
00039     typedef FalseType Type;
00040     static const ValueType Value = false;
00041     operator ValueType() { return Value; }
00042   };
00043 
00044   template<typename, typename>
00045   struct IsSame
00046     : public FalseType
00047   {
00048   };
00049 
00050   template<typename T>
00051   struct IsSame<T, T>
00052     : public TrueType
00053   {
00054   };
00055 
00058 } // end namespace itk
00059 
00060 #endif //__itkIsSame_h
00061