greenplumn CWStringStatic 源码
greenplumn CWStringStatic 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/string/CWStringStatic.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CWStringStatic.h
//
// @doc:
// Wide character String class with buffer.
//---------------------------------------------------------------------------
#ifndef GPOS_CWStringStatic_H
#define GPOS_CWStringStatic_H
#include "gpos/base.h"
#include "gpos/string/CWString.h"
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// CWStringStatic
//
// @doc:
// Implementation of the string interface with buffer pre-allocation.
// Internally, the class uses a null-terminated WCHAR buffer to store the string
// characters. The buffer is assigned at construction time; its capacity cannot be
// modified, thus restricting the maximum size of the stored string. Attempting to
// store a larger string than the available buffer capacity results in truncation.
// CWStringStatic owner is responsible for allocating the buffer and releasing it
// after the object is destroyed.
//
//---------------------------------------------------------------------------
class CWStringStatic : public CWString
{
private:
// buffer capacity
ULONG m_capacity;
protected:
// appends the contents of a buffer to the current string
void AppendBuffer(const WCHAR *w_str_buffer) override;
public:
CWStringStatic(const CWStringStatic &) = delete;
// ctor
CWStringStatic(WCHAR w_str_buffer[], ULONG capacity);
// ctor with string initialization
CWStringStatic(WCHAR w_str_buffer[], ULONG capacity,
const WCHAR w_str_init[]);
// appends a string and replaces character with string
void AppendEscape(const CWStringBase *str, WCHAR wc,
const WCHAR *w_str_replace) override;
// appends a formatted string
void AppendFormat(const WCHAR *format, ...) override;
// appends a formatted string based on passed va list
void AppendFormatVA(const WCHAR *format, VA_LIST va_args);
// appends a null terminated character array
void AppendCharArray(const CHAR *sz) override;
// appends a null terminated wide character array
void AppendWideCharArray(const WCHAR *w_str) override;
// dtor - owner is responsible for releasing the buffer
~CWStringStatic() override = default;
// resets string
void Reset() override;
};
} // namespace gpos
#endif // !GPOS_CWStringStatic_H
// EOF
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