greenplumn CPrintPrefix 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CPrintPrefix.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CPrintPrefix.h
/
/ @doc:
/ Implemenation of prefix sequence for debug print functions;
/ In the common use case the actual strings are constants and a chain
/ of prefixes is built up on the stack;
/ Not ref-counted nor does it own any of the data it points to.
/---------------------------------------------------------------------------
#ifndef GPOS_CPrintPrefix_H
#define GPOS_CPrintPrefix_H
#include "gpos/base.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CPrintPrefix
/
/ @doc:
/ Prefix element for debug print functions
/
/---------------------------------------------------------------------------
class CPrintPrefix
{
private:
/ previous prefix; usually in the previous stack frame
const CPrintPrefix *m_ppfx;
/ actual string
const CHAR *m_sz;
public:
/ ctor
explicit CPrintPrefix(const CPrintPrefix *, const CHAR *);
/ print
IOstream &OsPrint(IOstream &os) const;
}; / class CPrintPrefix
/ shorthand for printing
inline IOstream &
operator<<(IOstream &os, CPrintPrefix &pfx)
{
return pfx.OsPrint(os);
}
} / namespace gpopt
#endif / !GPOS_CPrintPrefix_H
/ EOF
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