On 02/02/2011 08:23, Frédéric Bron wrote:
Could it be a problem of line ending (windows/linux)? Could you try with that version: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=type_tr...
I just tried and it gives the same error. Actually it seems MSVC doesn't like "not", "or" and "and" : replacing them with "!", "||" and "&&" makes the error (and the warning) go away. However next, the following code : BOOST_STATIC_ASSERT(( boost::has_operator_left_shift< int, int
::value ));
Yields the rather non-informative error : ..... the code ..... : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int (yes that's the only line in the error trace...) And : BOOST_STATIC_ASSERT(( boost::has_operator_left_shift< std::ostream, int >::value )); Adds a warning on top of the same error : boost/type_traits/detail/has_binary_operator.hpp(106) : warning C4913: user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used boost/type_traits/detail/has_binary_operator.hpp(142) : see reference to class template instantiation 'boost::detail::has_operator_left_shift_impl::has_operator_left_shift_impl<LHS,RHS,RET>' being compiled with [ LHS=std::ostream, RHS=int, RET=void ] ..... the code ..... : see reference to class template instantiation 'boost::has_operator_left_shift<LHS,RHS>' being compiled with [ LHS=std::ostream, RHS=int ] ..... the code ..... : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int I will try and have another look later today, do you have any idea where the problem might be ?
However it doesn't work with a pointer type, for instance this fails : BOOST_STATIC_ASSERT(( boost::has_operator_left_shift< std::ostream, void*::value )); Can you say what you mean by it doesn't work? Do you mean compile error or returns the wrong value?
Sorry, I meant the assertion fails. Another case which doesn't compile however is : struct convertible_ambiguous { operator int() const; operator float() const; }; BOOST_STATIC_ASSERT(( boost::has_operator_left_shift< std::ostream, convertible_ambiguous >::value )); Thanks ! MAT.