greenplumn CPrintPrefix 源码
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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