text: //=================================================================================================
  /*!
  //  \file blaze/util/typetraits/IsEmpty.h
  //  \brief Header file for the IsEmpty type trait
  //
  //  Copyright (C) 2012-2018 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_UTIL_TYPETRAITS_ISEMPTY_H_
  #define _BLAZE_UTIL_TYPETRAITS_ISEMPTY_H_
  
  
  //*************************************************************************************************
  // Includes
  //*************************************************************************************************
  
  #include <type_traits>
  #include <blaze/util/IntegralConstant.h>
  
  
  namespace blaze {
  
  //=================================================================================================
  //
  //  CLASS DEFINITION
  //
  //=================================================================================================
  
  //*************************************************************************************************
  /*!\brief Compile time type check.
  // \ingroup type_traits
  //
  // This class tests whether the given template parameter is an empty class type, i.e. a type
  // without member data and virtual functions. If it is an empty class 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
     class A {};
     class B { int i; };
  
     blaze::IsEmpty<A>::value           // Evaluates to 'true'
     blaze::IsEmpty<A volatile>::Type   // Results in TrueType
     blaze::IsEmpty<A const>            // Is derived from TrueType
     blaze::IsEmpty<int>::value         // Evaluates to 'false'
     blaze::IsEmpty<std::string>::Type  // Results in FalseType
     blaze::IsEmpty<B>                  // Is derived from FalseType
     \endcode
  */
  template< typename T >
  struct IsEmpty
     : public BoolConstant< std::is_empty<T>::value >
  {};
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*!\brief Auxiliary variable template for the IsEmpty type trait.
  // \ingroup type_traits
  //
  // The IsEmpty_v variable template provides a convenient shortcut to access the nested \a value
  // of the IsEmpty class template. For instance, given the type \a T the following two statements
  // are identical:
  
     \code
     constexpr bool value1 = blaze::IsEmpty<T>::value;
     constexpr bool value2 = blaze::IsEmpty_v<T>;
     \endcode
  */
  template< typename T >
  constexpr bool IsEmpty_v = IsEmpty<T>::value;
  //*************************************************************************************************
  
  } // namespace blaze
  
  #endif
  