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IsMultExpr.h
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1 //=================================================================================================
33 //=================================================================================================
34 
35 #ifndef _BLAZE_MATH_TYPETRAITS_ISMULTEXPR_H_
36 #define _BLAZE_MATH_TYPETRAITS_ISMULTEXPR_H_
37 
38 
39 //*************************************************************************************************
40 // Includes
41 //*************************************************************************************************
42 
43 #include <boost/type_traits/is_base_of.hpp>
45 #include <blaze/util/FalseType.h>
46 #include <blaze/util/SelectType.h>
47 #include <blaze/util/TrueType.h>
48 
49 
50 namespace blaze {
51 
52 //=================================================================================================
53 //
54 // CLASS DEFINITION
55 //
56 //=================================================================================================
57 
58 //*************************************************************************************************
63 template< typename T >
64 struct IsMultExprHelper
65 {
66  //**********************************************************************************************
67  enum { value = boost::is_base_of<MultExpr,T>::value && !boost::is_base_of<T,MultExpr>::value };
68  typedef typename SelectType<value,TrueType,FalseType>::Type Type;
69  //**********************************************************************************************
70 };
72 //*************************************************************************************************
73 
74 
75 //*************************************************************************************************
89 template< typename T >
90 struct IsMultExpr : public IsMultExprHelper<T>::Type
91 {
92  public:
93  //**********************************************************************************************
95  enum { value = IsMultExprHelper<T>::value };
96  typedef typename IsMultExprHelper<T>::Type Type;
98  //**********************************************************************************************
99 };
100 //*************************************************************************************************
101 
102 } // namespace blaze
103 
104 #endif
Compile time check whether the given type is a multiplication expression template.This type trait class tests whether or not the given type Type is a multiplication expression template (i.e. an expression representing an element-wise vector multiplication, a matrix/vector multiplication, a vector/matrix multiplication, or a matrix multiplication). In order to qualify as a valid multiplication expression template, the given type has to derive (publicly or privately) from the MultExpr base class. In case the given type is a valid multiplication expression template, the value member enumeration is set to 1, the nested type definition Type is TrueType, and the class derives from TrueType. Otherwise value is set to 0, Type is FalseType, and the class derives from FalseType.
Definition: IsMultExpr.h:90
Header file for the FalseType type/value trait base class.
Header file for the MultExpr base class.
Header file for the SelectType class template.
Header file for the TrueType type/value trait base class.