ptr_fun()

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.

Detailed Description

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

Example:

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

If the function pointer is to an overloaded type, you must specify the types using template arguments.

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

ptr_fun()

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.