text: //=================================================================================================
  /*!
  //  \file blaze/math/typetraits/IsColumnVector.h
  //  \brief Header file for the IsColumnVector type trait
  //
  //  Copyright (C) 2012-2019 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_ISCOLUMNVECTOR_H_
  #define _BLAZE_MATH_TYPETRAITS_ISCOLUMNVECTOR_H_
  
  
  //*************************************************************************************************
  // Includes
  //*************************************************************************************************
  
  #include <blaze/math/expressions/Vector.h>
  #include <blaze/math/TransposeFlag.h>
  #include <blaze/util/FalseType.h>
  #include <blaze/util/TrueType.h>
  
  
  namespace blaze {
  
  //=================================================================================================
  //
  //  CLASS DEFINITION
  //
  //=================================================================================================
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Auxiliary helper struct for the IsColumnVector type trait.
  // \ingroup math_type_traits
  */
  template< typename T >
  struct IsColumnVectorHelper
  {
   private:
     //**********************************************************************************************
     static T* create();
  
     template< typename VT >
     static TrueType test( const Vector<VT,columnVector>* );
  
     template< typename VT >
     static TrueType test( const volatile Vector<VT,columnVector>* );
  
     static FalseType test( ... );
     //**********************************************************************************************
  
   public:
     //**********************************************************************************************
     using Type = decltype( test( create() ) );
     //**********************************************************************************************
  };
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*!\brief Compile time check for column vector types.
  // \ingroup math_type_traits
  //
  // This type trait tests whether or not the given template argument is a column dense or sparse
  // vector type (i.e. a vector whose transposition flag is set to blaze::columnVector). In case
  // the type is a column vector type, the \a value member constant is set to \a true, the nested
  // type definition \a Type is \a TrueType, and the class derives from \a TrueType. Otherwise
  // \a value is set to \a false, \a Type is \a FalseType, and the class derives from \a FalseType.
  
     \code
     using blaze::columnVector;
     using blaze::rowVector;
  
     blaze::IsColumnVector< StaticVector<float,3U,columnVector> >::value      // Evaluates to 1
     blaze::IsColumnVector< const DynamicVector<double,columnVector> >::Type  // Results in TrueType
     blaze::IsColumnVector< volatile CompressedVector<int,columnVector> >     // Is derived from TrueType
     blaze::IsColumnVector< StaticVector<float,3U,rowVector> >::value         // Evaluates to 0
     blaze::IsColumnVector< const DynamicVector<double,rowVector> >::Type     // Results in FalseType
     blaze::IsColumnVector< volatile CompressedVector<int,rowVector> >        // Is derived from FalseType
     \endcode
  */
  template< typename T >
  struct IsColumnVector
     : public IsColumnVectorHelper<T>::Type
  {};
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Specialization of the IsColumnVector type trait for references.
  // \ingroup math_type_traits
  */
  template< typename T >
  struct IsColumnVector<T&>
     : public FalseType
  {};
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*!\brief Auxiliary variable template for the IsColumnVector type trait.
  // \ingroup type_traits
  //
  // The IsColumnVector_v variable template provides a convenient shortcut to access the nested
  // \a value of the IsColumnVector class template. For instance, given the type \a T the
  // following two statements are identical:
  
     \code
     constexpr bool value1 = blaze::IsColumnVector<T>::value;
     constexpr bool value2 = blaze::IsColumnVector_v<T>;
     \endcode
  */
  template< typename T >
  constexpr bool IsColumnVector_v = IsColumnVector<T>::value;
  //*************************************************************************************************
  
  } // namespace blaze
  
  #endif
  