text: //=================================================================================================
  /*!
  //  \file blaze/math/typetraits/HasConstDataAccess.h
  //  \brief Header file for the HasConstDataAccess type trait
  //
  //  Copyright (C) 2013 Klaus Iglberger - All Rights Reserved
  //
  //  This file is part of the Blaze library. You can redistribute it and/or modify it under
  //  the terms of the New (Revised) BSD License. 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.
  //  3. Neither the names of the Blaze development group nor the names of its contributors
  //     may be used to endorse or promote products derived from this software without specific
  //     prior written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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.
  */
  //=================================================================================================
  
  #ifndef _BLAZE_MATH_TYPETRAITS_HASCONSTDATAACCESS_H_
  #define _BLAZE_MATH_TYPETRAITS_HASCONSTDATAACCESS_H_
  
  
  //*************************************************************************************************
  // Includes
  //*************************************************************************************************
  
  #include <blaze/util/FalseType.h>
  #include <blaze/util/TrueType.h>
  
  
  namespace blaze {
  
  //=================================================================================================
  //
  //  CLASS DEFINITION
  //
  //=================================================================================================
  
  //*************************************************************************************************
  /*!\brief Compile time check for low-level access to constant data.
  // \ingroup math_type_traits
  //
  // This type trait tests whether the given data type provides a low-level access to constant data
  // via a const 'data' member function. In case the according member function is provided, the
  // \a value member enumeration is set to 1, the nested type definition \a Type is \a TrueType, and
  // the class derives from \a TrueType. Otherwise \a value is set to 0, \a Type is \a FalseType,
  // and the class derives from \a FalseType. Examples:
  
     \code
     blaze::HasConstDataAccess< StaticVector<float,3U> >::value      // Evaluates to 1
     blaze::HasConstDataAccess< const DynamicVector<double> >::Type  // Results in TrueType
     blaze::HasConstDataAccess< volatile DynamicMatrix<int> >        // Is derived from TrueType
     blaze::HasConstDataAccess< int >::value                         // Evaluates to 0
     blaze::HasConstDataAccess< const CompressedVector<int> >::Type  // Results in FalseType
     blaze::HasConstDataAccess< volatile CompressedMatrix<int> >     // Is derived from FalseType
     \endcode
  */
  template< typename T >
  struct HasConstDataAccess : public FalseType
  {
   public:
     //**********************************************************************************************
     /*! \cond BLAZE_INTERNAL */
     enum { value = 0 };
     typedef FalseType  Type;
     /*! \endcond */
     //**********************************************************************************************
  };
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Specialization of the HasConstDataAccess type trait for const types.
  // \ingroup math_type_traits
  */
  template< typename T >
  struct HasConstDataAccess< const T > : public HasConstDataAccess<T>::Type
  {
   public:
     //**********************************************************************************************
     enum { value = HasConstDataAccess<T>::value };
     typedef typename HasConstDataAccess<T>::Type  Type;
     //**********************************************************************************************
  };
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Specialization of the HasConstDataAccess type trait for volatile types.
  // \ingroup math_type_traits
  */
  template< typename T >
  struct HasConstDataAccess< volatile T > : public HasConstDataAccess<T>::Type
  {
   public:
     //**********************************************************************************************
     enum { value = HasConstDataAccess<T>::value };
     typedef typename HasConstDataAccess<T>::Type  Type;
     //**********************************************************************************************
  };
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Specialization of the HasConstDataAccess type trait for cv qualified types.
  // \ingroup math_type_traits
  */
  template< typename T >
  struct HasConstDataAccess< const volatile T > : public HasConstDataAccess<T>::Type
  {
   public:
     //**********************************************************************************************
     enum { value = HasConstDataAccess<T>::value };
     typedef typename HasConstDataAccess<T>::Type  Type;
     //**********************************************************************************************
  };
  /*! \endcond */
  //*************************************************************************************************
  
  } // namespace blaze
  
  #endif
  