71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
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#if !defined(CTRL__SmObject_h__INCLUDED)
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#define CTRL__SmObject_h__INCLUDED
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#pragma once
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/***************************************************************************\
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*****************************************************************************
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*
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* class SmObjectT
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*
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* SmObjectT defines a common implementation class for building COM objects.
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* To create a new object type
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* - Define an interface
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* - Create a class that implements that interface except the COM functions
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* - Derive a class from SmObjectT that provides a Build() function to create
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* new instances.
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*
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*****************************************************************************
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\***************************************************************************/
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template <class base, class iface>
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class SmObjectT : public base
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{
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// Operations
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public:
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STDMETHOD(QueryInterface)(REFIID riid, void ** ppv)
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{
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if (ppv == NULL) {
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return E_POINTER;
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}
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int idx = 0;
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while (1) {
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if (IsEqualIID(riid, *base::s_rgpIID[idx])) {
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AddRef();
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iface * p = (iface *) this;
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*ppv = p;
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return S_OK;
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}
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idx++;
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if (base::s_rgpIID[idx] == NULL) {
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break;
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}
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}
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return E_NOINTERFACE;
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}
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STDMETHOD_(ULONG, AddRef)()
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{
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return ++m_cRef;
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}
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STDMETHOD_(ULONG, Release)()
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{
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ULONG ul = --m_cRef;
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if (ul == 0) {
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delete this;
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}
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return ul;
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}
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// Data
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protected:
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ULONG m_cRef;
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};
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#endif // CTRL__SmObject_h__INCLUDED
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