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identity.hpp File Reference

#include <boost/preprocessor/empty.hpp>

Defines

#define BOOST_PREPROCESSOR_IDENTITY(X)
 Expands to X once invoked. More...

Detailed Description

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Define Documentation

#define BOOST_PREPROCESSOR_IDENTITY (  X    ) 
 

Expands to X once invoked.

Designed to be used with BOOST_PREPROCESSOR_IF(), when one of the clauses need to be invoked.

Example: 

  BOOST_PREPROCESSOR_IDENTITY(X)()
  //                            ^^ NOTE!

The above expands to: 

  X

NOTE: If BOOST_PREPROCESSOR_IDENTITY() is not invoked, the expansion will not be usable.

© Copyright Housemarque, Inc. 2001

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