/usr/include/ITK-4.5/itkEnableIf.h is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* 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 __itkEnableIf_h
#define __itkEnableIf_h
namespace itk
{
/* \brief This is an implementation of the enable if idiom.
*
* Enable if is a common C++ meta-programming technique for example
* there is a boost implementation, for more information on its usage
* please see:
* http://www.boost.org/doc/libs/1_49_0/libs/utility/enable_if.html
*
* This template enables specialization of a templated function based
* on some traits or concepts. It is implemented with SFINAE.
*
* If the parameter V is true then the Type trait is the second
* template parameter, otherwise an implementation does not exist and
* with SFIANE another implementation may be choosen.
*
* Example:
* \code
*
* template< typename T>
* typename EnableIfC<
* IsSame<T, typename NumericTraits<T>::ValueType>::Value,
* T >::Type
* GetComponent(const T pix,
* unsigned int itkNotUsed( idx ) ) const
* {
* return pix;
* }
* \endcode
*
*/
template <bool V, typename T = void> struct EnableIfC {};
/** \cond SPECIALIZATION_IMPLEMENTATION */
template <typename T> struct EnableIfC<true, T> { typedef T Type; };
/**\endcond*/
/* \brief An implementation of the negation of the enable if idiom.
*
* \sa EnableIf
*/
template <bool V, typename T = void> struct DisableIfC {};
/** \cond SPECIALIZATION_IMPLEMENTATION */
template <typename T> struct DisableIfC<false, T> { typedef T Type; };
/**\endcond*/
}
#endif // __itkEnableIf_h
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