libsigc++: ptr_fun()

libsigc++ 3.8.1

Classes | Functions
ptr_fun()
Functors

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);
  sigc::ptr_fun
  decltype(auto) ptr_fun(T_return(*func)(T_args...))
  Creates a functor of type sigc::pointer_functor which wraps an existing non-member function.
  Definition ptr_fun.h:107

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.