C++ Boost

Boost.Preprocessor

Header <boost/preprocessor/logical/bool.hpp>
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#define BOOST_PP_BOOL(X)

Expands to 0 if X == 0 and 1 if X != 0.

X must be an integer literal in the range [0, BOOST_PP_LIMIT_MAG].

For example, BOOST_PP_BOOL(3) expands to 1.

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Revised

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