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identity.hpp File Reference


Defines

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

#define BOOST_PREPROCESSOR_IDENTITY(X)
 Obsolete. Use BOOST_PP_IDENTITY(). More...

Detailed Description

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Define Documentation

#define BOOST_PP_IDENTITY (  X    ) 
 

Expands to X once invoked.

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

For example, 

  BOOST_PP_IDENTITY(X)()
  //                  ^^ NOTE!

expands to: 

  X

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

#define BOOST_PREPROCESSOR_IDENTITY (  X    ) 
 

Obsolete. Use BOOST_PP_IDENTITY().

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