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        The header <boost/core/is_same.hpp>
        defines the class template boost::core::is_same<T1,T2>.
        It defines a nested integral constant value
        which is true when T1 and T2
        are the same type, and false
        when they are not.
      
        In tandem with BOOST_TEST_TRAIT_TRUE
        and BOOST_TEST_TRAIT_FALSE,
        is_same is useful for writing
        tests for traits classes that have to define specific nested types.
      
namespace boost { namespace core { template<class T1, class T2> struct is_same; } }
#include <boost/core/lightweight_test_trait.hpp> #include <boost/core/is_same.hpp> template<class T> struct X { typedef T& type; }; using boost::core::is_same; int main() { BOOST_TEST_TRAIT_TRUE(( is_same<X<int>::type, int&> )); return boost::report_errors(); }