Re: [Boost-users] [wave] revisited is_defined_macro

Ovanes Markarian wrote:

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I have a question regardning the is_defined_macro member of context type. Is it intended, that this member is non-const? (CVS version as well)

Good catch! I'll change that.

And I just saw that there is no way to retrieve the macro value. If I can query if some macro is defined, why can't I retrieve its value if it is not a function like macro. The other solution would be to implement preprocessing_hooks, but I would prefer to have a member function which can retrieve this value for me.

There is the function get_macro_definition() allowing to retrieve the complete set of information about a defined macro. As I recognized just right now, this is not documented for some reason. So here you go: Let's assume: typedef context_type::position_type position_type; typedef context_type::token_type token_type; typedef context_type::token_sequence_type token_sequence_type; get_macro_definition bool get_macro_definition( token_type::string_type const &name, bool &is_function_style, bool &is_predefined, position_type &pos, std::vector ¶meters, token_sequence_type &definition); Where name: the name of the macro the information should be returned for is_function_style: will be true if the macro in question is a function style macro is_predefined: will be true if the macro has been predefined pos: the position information of the point of the macro definition parameters: the list of names of the parameters this macro was defined with definition: the token sequence containing the macro definition (body) The function returns true if the macro was defined and the information has been successfully retrieved, false otherwise. I'll add this description to the library documentation asap. Regards Hartmut