Use tr1 in C ++ to implement functor/function pointer/member function pointer

1. header file # include <functional>

2. Define the functor variable:

Std: tr1: function <T * (P1 *, P2 *)> DpdCreateT;

BCB can use typedef to declare a function.

Typedef T * (Delegate) (P1 *, P2 *);

Std: tr1: function <Delegate> DpdCreateT;

 

3. Connection:

Class Functions

Xx. DpdCreateT = std: tr1: bind (

& ZZZ: CreateConnection, // class function address

& Instance, // object instance address

Std: tr1: placeholders: _ 1, // placeholder for parameter 1

Std: tr1: placeholders: _ 2 // placeholder for parameter 1

);

Global function. assign a value directly.

Xx. DpdCreateT = GlobalCreateFunction;

 

//------------------------------------------------------------------------------

Simple function pointer

Typedef void (* FooPtr) (int, double );

Void Foo (int anInt, double aDouble)
{
Std: cout <"Foo () =" <anInt <"," <aDouble <endl;
}

FooPtr func = & Foo;
(* Func) (1, 2.0 );

//------------------------------------------------------------------------------

Member function pointer

Typedef int (SomeClass: * MemberFooPtr) (int, double );

MemberFooPtr p;

SomeClass SC;

P = & SomeClass: Foo;
(SC. * p) (1, 2 );

 

//-------------------------------------------------------------------------------

In VS 2008

# Include <functional>

Definition:

Typedef void (SetFrameValueActionDelegate) (T *, V frameValue );
Std: tr1: function <SetFrameValueActionDelegate> SetFrameValueAction;

 

Binding:

MWeekViewGroupLocationAnimation. SetFrameValueAction
=Std: tr1: bind(& MyClass: mWeekViewGroup_LocationAnimation_SetFrameValue,
& MRenderGroupWeekView,
Std: tr1: placeholders: _ 2);