Simplify Callback overloads by using template parameter packs (#5983)

The event.h definition now uses template parameter packs, so update the documentation to match.

Author: oldnewthing

docs/cppcx/wrl/callback-function-wrl.md

@@ -20,166 +20,14 @@ template<
 ComPtr<TDelegateInterface> Callback(
    TCallback callback
 );
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)()
-);
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject,
-   typename TArg1
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1)
-);
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject,
-   typename TArg1,
-   typename TArg2
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1,
-   TArg2)
-);
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject,
-   typename TArg1,
-   typename TArg2,
-   typename TArg3
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1,
-   TArg2,
-   TArg3)
-);
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject,
-   typename TArg1,
-   typename TArg2,
-   typename TArg3,
-   typename TArg4
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1,
-   TArg2,
-   TArg3,
-   TArg4)
-);
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject,
-   typename TArg1,
-   typename TArg2,
-   typename TArg3,
-   typename TArg4,
-   typename TArg5
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1,
-   TArg2,
-   TArg3,
-   TArg4,
-   TArg5)
-);
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject,
-   typename TArg1,
-   typename TArg2,
-   typename TArg3,
-   typename TArg4,
-   typename TArg5,
-   typename TArg6
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1,
-   TArg2,
-   TArg3,
-   TArg4,
-   TArg5,
-   TArg6)
-);
 template<
    typename TDelegateInterface,
    typename TCallbackObject,
-   typename TArg1,
-   typename TArg2,
-   typename TArg3,
-   typename TArg4,
-   typename TArg5,
-   typename TArg6,
-   typename TArg7
+   typename... TArgs
 >
 ComPtr<TDelegateInterface> Callback(
    _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1,
-   TArg2,
-   TArg3,
-   TArg4,
-   TArg5,
-   TArg6,
-   TArg7)
-);
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject,
-   typename TArg1,
-   typename TArg2,
-   typename TArg3,
-   typename TArg4,
-   typename TArg5,
-   typename TArg6,
-   typename TArg7,
-   typename TArg8
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1,
-   TArg2,
-   TArg3,
-   TArg4,
-   TArg5,
-   TArg6,
-   TArg7,
-   TArg8)
-);
-template<
-   typename TDelegateInterface,
-   typename TCallbackObject,
-   typename TArg1,
-   typename TArg2,
-   typename TArg3,
-   typename TArg4,
-   typename TArg5,
-   typename TArg6,
-   typename TArg7,
-   typename TArg8,
-   typename TArg9
->
-ComPtr<TDelegateInterface> Callback(
-   _In_ TCallbackObject *object,
-   _In_ HRESULT (TCallbackObject::* method)(TArg1,
-   TArg2,
-   TArg3,
-   TArg4,
-   TArg5,
-   TArg6,
-   TArg7,
-   TArg8,
-   TArg9)
+   _In_ HRESULT (TCallbackObject::* method)(TArgs...)
 );
 ```
 
@@ -194,32 +42,8 @@ A template parameter that specifies the type of an object that represents an obj
 *TCallbackObject*<br/>
 A template parameter that specifies the object whose member function is the method to call when an event occurs.
 
-*TArg1*<br/>
-A template parameter that specifies the type of the first callback method argument.
-
-*TArg2*<br/>
-A template parameter that specifies the type of the second callback method argument.
-
-*TArg3*<br/>
-A template parameter that specifies the type of the third callback method argument.
-
-*TArg4*<br/>
-A template parameter that specifies the type of the fourth callback method argument.
-
-*TArg5*<br/>
-A template parameter that specifies the type of the fifth callback method argument.
-
-*TArg6*<br/>
-A template parameter that specifies the type of the sixth callback method argument.
-
-*TArg7*<br/>
-A template parameter that specifies the type of the seventh callback method argument.
-
-*TArg8*<br/>
-A template parameter that specifies the type of the eighth callback method argument.
-
-*TArg9*<br/>
-A template parameter that specifies the type of the ninth callback method argument.
+*TArgs*<br/>
+A template parameter pack that specifies the types of the callback method arguments.
 
 *callback*<br/>
 An object that represents the callback object and its member function.