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# Boost.Preprocessor

## Reference

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# #include <boost/preprocessor/comma_if.hpp>

## #define BOOST_PP_COMMA_IF(COND)

Expands to a comma if `COND != 0` and nothing if `COND == 0`.

`COND` must expand to an integer literal in the range [0, BOOST_PP_LIMIT_MAG].

For example, `BOOST_PP_COMMA_IF(0)` expands to nothing.

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