[Boost-users] [preprocessor] Identity function for token concatenation

Subject: [Boost-users] [preprocessor] Identity function for token concatenation
From: Jeremiah Willcock (jewillco_at_[hidden])
Date: 2012-06-18 13:35:19

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.

-- Jeremiah Willcock