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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file tokpaste.h
* @brief Token-pasting macros.
**/
#ifndef TOR_LIB_CC_TOKPASTE_H
#define TOR_LIB_CC_TOKPASTE_H
/**
* Concatenate `a` and `b` in a way that allows their result itself to be
* expanded by the preprocessor.
*
* Ordinarily you could just say `a ## b` in a macro definition. But doing so
* results in a symbol which the preprocessor will not then expand. If you
* wanted to use `a ## b` to create the name of a macro and have the
* preprocessor expand _that_ macro, you need to have another level of
* indirection, as this macro provides.
**/
#define PASTE(a,b) PASTE__(a,b)
/** Helper for PASTE(). */
#define PASTE__(a,b) a ## b
#endif /* !defined(TOR_LIB_CC_TOKPASTE_H) */
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