ptr_fun() creates a functor from a pointer to a function. More...

Classes
class	sigc::pointer_functor< T_return, T_args >
	pointer_functor wraps existing non-member functions with, or without, arguments. More...

Functions
template<typename T_return , typename... T_args>
decltype(auto)	sigc::ptr_fun (T_return(* func)(T_args...))
	Creates a functor of type sigc::pointer_functor which wraps an existing non-member function. More...

Detailed Description

ptr_fun() creates a functor from a pointer to a function.

If the function pointer is to an overloaded type, you must specify the types using template arguments starting with the first argument. It is not necessary to supply the return type.

Example:

void foo(int) {}
sigc::slot<void(int)> sl = sigc::ptr_fun(&foo);

Example:

void foo(int) {}  // choose this one
void foo(float) {}
void foo(int, int) {}
sigc::slot<void(long)> sl = sigc::ptr_fun<void, int>(&foo);

ptr_fun() can also be used to convert a pointer to a static member function to a functor, like so:

Example:

struct foo
{
  static void bar(int) {}
};
sigc::slot<void(int)> sl = sigc::ptr_fun(&foo::bar);

Function Documentation

template <typename T_return , typename... T_args>

decltype(auto) sigc::ptr_fun ( T_return(*)(T_args...)  func )

inline

Creates a functor of type sigc::pointer_functor which wraps an existing non-member function.

Parameters

func	Pointer to function that should be wrapped.

Returns

Functor that executes func on invocation.