On Mon, Jun 18, 2012 at 10:35 AM, Jeremiah Willcock
Boost.Preprocessor has a macro BOOST_PP_INTERCEPT to eat a numeric value that it is token-concatenated onto. Is there a similar macro that just returns the value? I.e., some BOOST_PP_EMPTY_FOR_CONCAT such that BOOST_PP_EMPTY_FOR_CONCAT ## 3 turns into 3? As with BOOST_PP_INTERCEPT, it only needs to work for small integer values. Is there some other technique I can use for this? I am using it to generate std::get<> invocations in BOOST_PP_ENUM_BINARY_PARAMS. Thank you for your help.
I don't know any such facility in Boost.PP, but it's pretty trivial to generate: #define X0 0 #define X1 1 #define X2 2 // etc. ...which makes me think I might be overlooking something in Boost.PP :/ Somewhat related: what do your ENUM_BINARY_PARAMS invocations look like? I know I've gotten away with cat'ing template parameter delimiters ("<" and ">") against preprocessor integer tokens. Probably not really helping, - Jeff