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Home Page: http://marcmo.github.io/delegates/
License: MIT License
small delegate implementation
Home Page: http://marcmo.github.io/delegates/
License: MIT License
Following on from test and example code, s.registerDelegate(d)
will fail if d
is not a free function.
void test() {
// Free function works fine
// auto d = make_delegate(&myFreeFunction);
// But member methods will create an error
A a;
auto d = make_delegate(&A::simple, a);
Service s;
s.registerDelegate(d);
// Error (active) a reference of type "ServiceDelegate &" (not
// const-qualified) cannot be initialized with a value of type
// "dlgt::delegate<void (A::*)()>"
// Error C2664 'void Service::registerDelegate(ServiceDelegate &)': cannot
// convert argument 1 from 'dlgt::delegate<void (__cdecl A::* )(void)>' to
// 'ServiceDelegate &'
s.notifyDelegate();
}
The code for const function delegates causes a compilation error in VC++ 2013:
template<typename return_type, typename... params>
class Delegate<return_type(params...) const>
: public BaseDelegate<return_type, params...>
{
typedef BaseDelegate<return_type, params...> Base;
public:
Delegate(void* callee, typename Base::Pointer2Function function)
: Base(callee, function)
{ }
};
error C2953: 'Delegate<return_type(params...),>' : class template has already been defined.
Which also causes an error further down in the file:
template<return_type(T::*Func)(params...) const>
inline static Delegate<return_type(params...) const> CreateC(T* o)
{
return Delegate<return_type(params...) const>(o, &DelegateFactory::MethodCallerC<Func>);
}
'abstract declarator' : modifiers not allowed on nonmember functions
Here is what is needed for it to fully build:
#ifndef _MSC_VER
template<typename return_type, typename... params>
class Delegate<return_type(params...) const>
: public BaseDelegate<return_type, params...>
{
typedef BaseDelegate<return_type, params...> Base;
public:
Delegate(void* callee, typename Base::Pointer2Function function)
: Base(callee, function)
{ }
};
#endif
...
#ifdef _MSC_VER
template<return_type(T::*Func)(params...) const>
inline static Delegate<return_type(params...)/* const*/> CreateC(T* o)
{
return Delegate<return_type(params...)/* const*/>(o, &DelegateFactory::MethodCallerC<Func>);
}
#else
template<return_type(T::*Func)(params...) const>
inline static Delegate<return_type(params...) const> CreateC(T* o)
{
return Delegate<return_type(params...) const>(o, &DelegateFactory::MethodCallerC<Func>);
}
#endif
Were you able to get this to build in Visual C++?
Thanks.
Would it be possible to use these delegates with lambdas? It does not seem to have support for this at the moment but I am hoping that it won't be to difficult to implement?
I am not sure if this was intentional but the new implementation requires that the type of the class be part of the template type for member functions. This was not the case with the previous implementation. In other words, the type of a delegate now restricts it for use on a certain type.
I would assume that this is not part of the plan because if this is allowable then the concept of this delegate system does not make it any more useful than standard C++ member function pointers. Or am I missing something?
Does this work on Windows? Has it been tested with MSVC++?
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