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tokpaste.h (954B)

      1 /* Copyright (c) 2001 Matej Pfajfar.
      2 * Copyright (c) 2001-2004, Roger Dingledine.
      3 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
      4 * Copyright (c) 2007-2021, The Tor Project, Inc. */
      5 /* See LICENSE for licensing information */
      6 
      7 /**
      8 * @file tokpaste.h
      9 * @brief Token-pasting macros.
     10 **/
     11 
     12 #ifndef TOR_LIB_CC_TOKPASTE_H
     13 #define TOR_LIB_CC_TOKPASTE_H
     14 
     15 /**
     16 * Concatenate `a` and `b` in a way that allows their result itself to be
     17 * expanded by the preprocessor.
     18 *
     19 * Ordinarily you could just say `a ## b` in a macro definition.  But doing so
     20 * results in a symbol which the preprocessor will not then expand.  If you
     21 * wanted to use `a ## b` to create the name of a macro and have the
     22 * preprocessor expand _that_ macro, you need to have another level of
     23 * indirection, as this macro provides.
     24 **/
     25 #define PASTE(a,b) PASTE__(a,b)
     26 
     27 /** Helper for PASTE(). */
     28 #define PASTE__(a,b) a ## b
     29 
     30 #endif /* !defined(TOR_LIB_CC_TOKPASTE_H) */