I can easily bind member functions to a std::function
by wrapping them with a lambda expression with capture clause.
class Class
{
Class()
{
Register([=](int n){ Function(n); });
}
void Register(std::function<void(int)> Callback)
{
}
void Function(int Number)
{
}
};
But I want to bind them directly, something like the following.
// ...
Register(&Class::Function);
// ...
I think according to the C++11 standard, this should be supported. However, in Visual Studio 11 I get these compiler errors.
error C2440: 'newline' : cannot convert from 'int' to 'Class *'
error C2647: '.*' : cannot dereference a 'void (__thiscall Class::* )(int)' on a 'int'
I think according to the C++11 standard, this should be supported
Not really, because a non-static member function has an implicit first parameter of type (cv-qualified) YourType*
, so in this case it does not match void(int)
. Hence the need for std::bind
:
Register(std::bind(&Class::Function, PointerToSomeInstanceOfClass, _1));
For example
Class c;
using namespace std::placeholders; // for _1, _2 etc.
c.Register(std::bind(&Class::Function, &c, _1));
Edit You mention that this is to be called with the same Class
instance. In that case, you can use a simple non-member function:
void foo(int n)
{
theClassInstance.Function(n);
}
then
Class c;
c.Register(foo);