greenplumn cdbdef 源码
greenplumn cdbdef 代码
文件路径：/src/include/cdb/cdbdef.h
/*-------------------------------------------------------------------------
*
* cdbdef.h
* Definitions for use anywhere
*
* Portions Copyright (c) 2005-2008, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/cdb/cdbdef.h
*
*-------------------------------------------------------------------------
*/
#ifndef CDBDEF_H
#define CDBDEF_H
/*
* CdbSwap
* Exchange the contents of two variables.
*/
#define CdbSwap(_type, _x, _y) \
do \
{ \
_type _t = (_x); \
_x = (_y); \
_y = (_t); \
} while (0)
/*
* CdbVisitOpt
* Some tree walkers use these codes to direct the traversal.
*/
typedef enum
{
CdbVisit_Walk = 1, /* proceed in normal sequence */
CdbVisit_Skip, /* no more calls for current node or its kids */
CdbVisit_Stop, /* break out of traversal, no more callbacks */
CdbVisit_Failure, /* break out of traversal, no more callbacks */
CdbVisit_Success /* break out of traversal, no more callbacks */
} CdbVisitOpt;
#endif /* CDBDEF_H */
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