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// -*- C++ -*-
//=============================================================================
/**
* @file Svc_Conf_Lexer_Guard.h
*
* $Id$
*
* @author Ossama Othman <ossama@uci.edu>
*/
//=============================================================================
#ifndef ACE_SVC_CONF_LEXER_GUARD_H
#define ACE_SVC_CONF_LEXER_GUARD_H
#include "ace/pre.h"
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
/// Forward declarations
class ACE_Svc_Conf_Param;
struct ace_yy_buffer_state;
/**
* @class ACE_Svc_Conf_Lexer_Guard
*
* @brief "Guard" that ensures lexer buffer switching is
* exception-safe.
*
* Buffers are switched, if necessary, each time a token is
* parsed/scanned. The buffer switching must be synchronized
* externally. This class performs no synchronization.
*
* @note Note that allocation/deallocation is done once during the
* processing of a service configurator directive. Memory
* managements is done at a higher level, not in this class.
* This is necessary to prevent an allocation/deallocation from
* occurring when parsing/scanning each token.
*/
class ACE_Svc_Conf_Lexer_Guard
{
public:
/// Constructor
/**
* Switches buffers, if necessary, when token scanning first
* begins. Allocation of the buffer will also occur if one has not
* already been allocated. This operation effectively pushes a
* buffer on to a stack.
*/
ACE_Svc_Conf_Lexer_Guard (ACE_Svc_Conf_Param *param);
/// Destructor
/**
* Switches buffers, if necessary when token scanning completes. No
* buffer deallocation occurs here. Buffers are deallocated when
* parsing of the entire directive is done, not when scanning of a
* single token is done. This operation effective pops a buffer off
* of a stack.
*/
~ACE_Svc_Conf_Lexer_Guard (void);
private:
/// Lexer buffer that corresponds to the current Service
/// Configurator file/direct scan.
ace_yy_buffer_state *buffer_;
};
#include "ace/post.h"
#endif /* ACE_SVC_CONF_LEXER_GUARD_H */
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