W:/Work/Software/Libraries/utl/include/utl/concepts/defines.h

utl typename constraints wrapper

template <utlConstrainType(SomeConcept) T> struct lala { };
// will expand to something like:
// template <SomeConcept T> struct lala { };
// or
// template <typename T> struct lala { };

#ifndef __utl_concepts_defines_h__
#define __utl_concepts_defines_h__


#if CXX_CONCEPTS
   #define utlConstrainType(_Concept_)   _Concept_
#else
   #define utlConstrainType(_Concept_)   typename
#endif

#if CXX_CONCEPTS
 #if __cpp_concepts <= 201507L
   #define _utlConcept   concept bool
 #else
   #define _utlConcept   concept
 #endif
#else
  #define _utlConcept    constexpr bool
#endif

#ifndef CXX_LIB_INVOKE
 #ifdef __cpp_lib_invoke
  #define CXX_LIB_INVOKE __cpp_lib_invoke
 #else
   #define CXX_LIB_INVOKE 0
 #endif
#endif


#endif /* __utl_concepts_defines_h__ */