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編譯器錯誤 C3741

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'class'： 必須是 coclass 時，event_receiver = true 的 'layout_dependent' 參數

若 layout_dependent=true 為 event_receiver 類別，則 類別也必須具有 coclass 屬性。

下列範例會產生 C3741

// C3741.cpp
// compile with: /c
// C3741 expected
#define _ATL_ATTRIBUTES 1
#include <atlbase.h>
#include <atlcom.h>
[module(name="xx")];

[object, uuid("00000000-0000-0000-0000-000000000001")]
__interface I{ HRESULT f(); };

// Delete the following line to resolve.
[ event_receiver(com, layout_dependent=true)]

// class or struct must be declared with coclass
// Uncomment the following line to resolve.
// [ event_receiver(com, layout_dependent=true), coclass, uuid("00000000-0000-0000-0000-000000000002")]
struct R : I {
   HRESULT f(){ return 0; }
   R(){}
   R(I* a){ __hook(I, a); }
};