greenplumn CWString 源码
greenplumn CWString 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/string/CWString.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CWString.h
//
// @doc:
// Wide character string interface.
//---------------------------------------------------------------------------
#ifndef GPOS_CWString_H
#define GPOS_CWString_H
#include "gpos/string/CWStringBase.h"
#define GPOS_MAX_FMT_STR_LENGTH (10 * 1024 * 1024) // 10MB
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// CWString
//
// @doc:
// Wide character String interface.
// Internally, the class uses a null-terminated WCHAR buffer to store the string characters.
// The class API provides functions for accessing the wide-character buffer and its length,
// as well as functions that modify the current string by appending another string to it,
// or that construct a string according to a given format.
// For constant strings consider using the CWStringConst class.
//
//---------------------------------------------------------------------------
class CWString : public CWStringBase
{
protected:
// null-terminated wide character buffer
WCHAR *m_w_str_buffer;
// appends the contents of a buffer to the current string
virtual void AppendBuffer(const WCHAR *w_str_buffer) = 0;
public:
// ctor
CWString(ULONG length);
// dtor
~CWString() override = default;
// returns the wide character buffer storing the string
const WCHAR *GetBuffer() const override;
// appends a string
void Append(const CWStringBase *str);
// appends a formatted string
virtual void AppendFormat(const WCHAR *format, ...) = 0;
// appends a string and replaces character with string
virtual void AppendEscape(const CWStringBase *str, WCHAR wc,
const WCHAR *w_str_replace) = 0;
// appends a null terminated character array
virtual void AppendCharArray(const CHAR *sz) = 0;
// appends a null terminated wide character array
virtual void AppendWideCharArray(const WCHAR *w_str) = 0;
// resets string
virtual void Reset() = 0;
};
} // namespace gpos
#endif // !GPOS_CWString_H
// EOF
相关信息
相关文章
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦