greenplumn IOstream 源码
greenplumn IOstream 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/io/IOstream.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// IOstream.h
//
// @doc:
// Output stream interface;
//---------------------------------------------------------------------------
#ifndef GPOS_IOstream_H
#define GPOS_IOstream_H
#include "gpos/types.h"
namespace gpos
{
// wide char ostream
using WOSTREAM = std::basic_ostream<WCHAR, std::char_traits<WCHAR>>;
//---------------------------------------------------------------------------
// @class:
// IOstream
//
// @doc:
// Defines all available operator interfaces; avoids having to overload
// system stream classes or their operators/member functions
//
//---------------------------------------------------------------------------
class IOstream
{
protected:
// ctor
IOstream() = default;
BOOL m_fullPrecision{false};
public:
enum EStreamManipulator
{
EsmDec,
EsmHex
// no sentinel to enforce strict switch-ing
};
// virtual dtor
virtual ~IOstream() = default;
// operator interface
virtual IOstream &operator<<(const CHAR *) = 0;
virtual IOstream &operator<<(const WCHAR) = 0;
virtual IOstream &operator<<(const CHAR) = 0;
virtual IOstream &operator<<(ULONG) = 0;
virtual IOstream &operator<<(ULLONG) = 0;
virtual IOstream &operator<<(INT) = 0;
virtual IOstream &operator<<(LINT) = 0;
virtual IOstream &operator<<(DOUBLE) = 0;
virtual IOstream &operator<<(const void *) = 0;
virtual IOstream &operator<<(WOSTREAM &(*) (WOSTREAM &) ) = 0;
virtual IOstream &operator<<(EStreamManipulator) = 0;
// needs to be implemented by subclass
virtual IOstream &operator<<(const WCHAR *) = 0;
void
SetFullPrecision(BOOL fullPrecision)
{
m_fullPrecision = fullPrecision;
}
};
} // namespace gpos
#endif // !GPOS_IOstream_H
// EOF
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