greenplumn COstream 源码
greenplumn COstream 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/io/COstream.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2008 - 2010 Greenplum, Inc.
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// COstream.h
//
// @doc:
// Partial implementation of output stream interface;
//---------------------------------------------------------------------------
#ifndef GPOS_COstream_H
#define GPOS_COstream_H
#include "gpos/base.h"
#include "gpos/io/IOstream.h"
#include "gpos/string/CWStringStatic.h"
// conversion buffer size
#define GPOS_OSTREAM_CONVBUF_SIZE (256)
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// COstream
//
// @doc:
// Defines all available operator interfaces; avoids having to overload
// system stream classes or their operators/member functions;
// When inheriting from this class, C++ hides 'all' overloaded
// versions of a function in the subclass, by default. Therefore, the
// compiler will not be able to 'see' the default implementations of the <<
// operator in subclasses of COstream. Use the 'using' keyword as in
// COstreamBasic.h to avoid the problem. Also refer to
// Effective C++ Third Edition, pp156
//
//---------------------------------------------------------------------------
class COstream : public IOstream
{
protected:
// constructor
COstream();
public:
using IOstream::operator<<;
COstream(COstream &) = delete;
// virtual dtor
~COstream() override = default;
// default implementations for the following interfaces available
IOstream &operator<<(const CHAR *) override;
IOstream &operator<<(const WCHAR) override;
IOstream &operator<<(const CHAR) override;
IOstream &operator<<(ULONG) override;
IOstream &operator<<(ULLONG) override;
IOstream &operator<<(INT) override;
IOstream &operator<<(LINT) override;
IOstream &operator<<(DOUBLE) override;
IOstream &operator<<(const void *) override;
// to support std:endl only
IOstream &operator<<(WOSTREAM &(*) (WOSTREAM &) ) override;
// set the stream modifier
IOstream &operator<<(EStreamManipulator) override;
private:
// formatting buffer
WCHAR m_string_format_buffer[GPOS_OSTREAM_CONVBUF_SIZE];
// wrapper string for formatting buffer
CWStringStatic m_static_string_buffer;
// current mode
EStreamManipulator m_stream_manipulator{EsmDec};
// append formatted string
IOstream &AppendFormat(const WCHAR *format, ...);
// what is the stream modifier?
EStreamManipulator GetStreamManipulator() const;
};
} // namespace gpos
#endif // !GPOS_COstream_H
// EOF
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