1.1 --- a/src/lemon/concept_check.h	Thu Nov 25 14:48:24 2004 +0000
     1.2 +++ b/src/lemon/concept_check.h	Sun Nov 28 16:30:10 2004 +0000
     1.3 @@ -41,7 +41,11 @@
     1.4  
     1.5    template <typename Concept, typename Type>
     1.6    inline void checkConcept() {
     1.7 -    function_requires<typename Concept::template Constraints<Type> >();
     1.8 +#if !defined(NDEBUG)
     1.9 +    typedef typename Concept::template Constraints<Type> ConceptCheck;
    1.10 +    void (ConceptCheck::*x)() = & ConceptCheck::constraints;
    1.11 +    ignore_unused_variable_warning(x);
    1.12 +#endif
    1.13    }
    1.14  
    1.15  #define BOOST_CLASS_REQUIRE(type_var, ns, concept) \