text: //=================================================================================================
  /*!
  //  \file blaze/math/typetraits/IsDiagonal.h
  //  \brief Header file for the IsDiagonal type trait
  //
  //  Copyright (C) 2012-2017 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_ISDIAGONAL_H_
  #define _BLAZE_MATH_TYPETRAITS_ISDIAGONAL_H_
  
  
  //*************************************************************************************************
  // Includes
  //*************************************************************************************************
  
  #include <blaze/math/typetraits/IsLower.h>
  #include <blaze/math/typetraits/IsUpper.h>
  #include <blaze/util/mpl/And.h>
  
  
  namespace blaze {
  
  //=================================================================================================
  //
  //  CLASS DEFINITION
  //
  //=================================================================================================
  
  //*************************************************************************************************
  /*!\brief Compile time check for diagonal matrices.
  // \ingroup math_type_traits
  //
  // This type trait tests whether or not the given template parameter is a diagonal matrix type
  // (i.e. a matrix type that is guaranteed to be diagonal at compile time). In case the type is
  // a diagonal matrix 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::rowMajor;
  
     using StaticMatrixType     = blaze::StaticMatrix<double,3UL,3UL,rowMajor>;
     using DynamicMatrixType    = blaze::DynamicMatrix<float,rowMajor>;
     using CompressedMatrixType = blaze::CompressedMatrix<int,rowMajor>;
  
     using DiagonalStaticType     = blaze::DiagonalMatrix<StaticMatrixType>;
     using DiagonalDynamicType    = blaze::DiagonalMatrix<DynamicMatrixType>;
     using DiagonalCompressedType = blaze::DiagonalMatrix<CompressedMatrixType>;
  
     using LowerStaticType  = blaze::LowerMatrix<StaticMatrixType>;
     using UpperDynamicType = blaze::UpperMatrix<DynamicMatrixType>;
  
     blaze::IsDiagonal< DiagonalStaticType >::value           // Evaluates to 1
     blaze::IsDiagonal< const DiagonalDynamicType >::Type     // Results in TrueType
     blaze::IsDiagonal< volatile DiagonalCompressedType >     // Is derived from TrueType
     blaze::IsDiagonal< LowerStaticMatrixType >::value        // Evaluates to 0
     blaze::IsDiagonal< const UpperDynamicMatrixType >::Type  // Results in FalseType
     blaze::IsDiagonal< volatile CompressedMatrixType >       // Is derived from FalseType
     \endcode
  */
  template< typename T >
  struct IsDiagonal
     : public And< IsLower<T>, IsUpper<T> >
  {};
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Specialization of the IsDiagonal type trait for const types.
  // \ingroup math_type_traits
  */
  template< typename T >
  struct IsDiagonal< const T >
     : public IsDiagonal<T>
  {};
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Specialization of the IsDiagonal type trait for volatile types.
  // \ingroup math_type_traits
  */
  template< typename T >
  struct IsDiagonal< volatile T >
     : public IsDiagonal<T>
  {};
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Specialization of the IsDiagonal type trait for cv qualified types.
  // \ingroup math_type_traits
  */
  template< typename T >
  struct IsDiagonal< const volatile T >
     : public IsDiagonal<T>
  {};
  /*! \endcond */
  //*************************************************************************************************
  
  } // namespace blaze
  
  #endif
  