73 lines
1.0 KiB
C++
73 lines
1.0 KiB
C++
// auto_bstr.h
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//
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// Same as auto_ptr but for BSTR
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#pragma once
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#include <xstddef>
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class auto_bstr
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{
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public:
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auto_bstr( BSTR b= 0, bool o= true)
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: _bstr(b), _Owns(o)
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{}
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~auto_bstr()
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{
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if(_bstr && _Owns)
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::SysFreeString(_bstr);
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}
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bool Ownership(bool fOwns)
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{ return _Owns = fOwns; }
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operator BSTR() { return _bstr; }
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operator const BSTR() const { return _bstr; }
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BSTR* operator &() {return &_bstr; }
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auto_bstr& operator=(auto_bstr& rhs)
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{
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if(_bstr == rhs._bstr)
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return *this;
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clear();
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_Owns= rhs._Owns;
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_bstr= rhs.release();
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return *this;
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}
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auto_bstr& operator=(BSTR bstr)
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{
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clear();
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_bstr= bstr;
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_Owns= true;
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return *this;
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}
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operator bool()
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{ return NULL != _bstr; }
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operator !()
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{ return NULL == _bstr; }
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void clear()
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{
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if(_bstr && _Owns)
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{
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::SysFreeString(_bstr);
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}
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_bstr= NULL;
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}
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BSTR release()
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{
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BSTR bstr= _bstr;
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_bstr= NULL;
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return bstr;
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}
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protected:
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bool _Owns;
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BSTR _bstr;
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};
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