57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (C) Microsoft Corporation, 1997 - 1997
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//
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// File: dyncast.h
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//
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//--------------------------------------------------------------------------
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//
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// dyncast.h: Handle dynamic and static casting
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//
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#ifndef _DYNCAST_H_
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#define _DYNCAST_H_
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// Macro to perform const_cast; i.e., cast away "const-ness" without
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// changing base type.
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#define CONST_CAST(type,arg) const_cast<type>(arg)
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//
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// Function templates for generating error-detecting dynamic casts.
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// The compiler will generate the needed version of this based upon the types
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// provided. 'DynCastThrow' should be used when you're certain of the
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// type of an object. 'PdynCast" should be used when you intend to check
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// whether the conversion was successful (result != NULL).
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// If 'USE_STATIC_CAST' is defined, static casting is done in DynCastThrow().
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//
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//#define USE_STATIC_CAST // Uncomment to force static casting
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//#define TIME_DYN_CASTS // Uncomment to generate timing information
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template <class BASE, class SUB>
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void DynCastThrow ( BASE * pbase, SUB * & psub )
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{
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#ifdef TIME_DYN_CASTS
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extern int g_cDynCasts;
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g_cDynCasts++;
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#endif
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#if defined(USE_STATIC_CAST) && !defined(_DEBUG)
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psub = (SUB *) pbase;
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#else
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psub = dynamic_cast<SUB *>(pbase);
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ASSERT_THROW( psub, EC_DYN_CAST,"subclass pointer conversion failure");
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#endif
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}
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template <class BASE, class SUB>
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SUB * PdynCast ( BASE * pbase, SUB * psub )
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{
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return dynamic_cast<SUB *>(pbase);
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}
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#endif // _DYNCAST_H_
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