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Subject: Re: [Boost-users] question about BOOST_CONCEPT_REQUIRES
From: Nathan Ridge (zeratul976_at_[hidden])
Date: 2013-08-18 15:26:54


> #include "boost/concept/requires.hpp" > #include "boost/concept_check.hpp" > #include <iterator> > template <typename T> > BOOST_CONCEPT_REQUIRES(( > ((boost::ForwardIterator<T>)) > ((boost::LessThanComparable< > typename std::iterator_traits<T>::value_type >>)) > ), > (void) > ) > bubble_sort(T begin, T end); > > if I compile this with gcc 4.5.3 I get some error messages which I don't > expect to see: You have an extra pair of parentheses grouping the requirements that shouldn't be there. It should be just: BOOST_CONCEPT_REQUIRES(                 // note: removed one '('     ((boost::ForwardIterator<T>))     ((boost::LessThanComparable<         typename std::iterator_traits<T>::value_type    >))     ,                                   // note: removed ')'     (void) ) bubble_sort(T begin, T end); See the example usage in the documentation [1]. Regards, Nate [1] http://www.boost.org/doc/libs/1_54_0/libs/concept_check/using_concept_check.htm


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