RWTFunctor2Imp< S1, S2 > Class Template Reference
[Functors]

Abstract base class for the family of functor bodies that are invoked with two caller arguments and whose invocation returns no value. More...

#include <rw/functor/RWTFunctor2Imp.h>

Inheritance diagram for RWTFunctor2Imp< S1, S2 >:

List of all members.

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Detailed Description

template<class S1, class S2>
class RWTFunctor2Imp< S1, S2 >

A function object, or a functor, encapsulates a call to an associated global or member function. When a functor is invoked, it calls the associated function.

RWTFunctor2Imp<S1,S2> is the abstract base class for the family of functor bodies that are invoked with two caller arguments, and whose invocation returns no value.

Each derived class name appends either a G (for global) or an M (for member), to indicate whether it is invoked upon an object. Static member functions use the G version since there is no object associated with the call.

The class name may also append A1 or A2, to indicate at construction that it takes callee arguments. These arguments are stored and added to the caller arguments at invocation time.

The six concrete class names are:

• RWTFunctor2GImp<S1,S2,DR,D1,D2>
  • No this object, no callee arguments

• RWTFunctor2GA1Imp<S1,S2,DR,D1,D2,A1>
  • No this object, one callee argument

• RWTFunctor2GA2Imp<S1,S2,DR,D1,D2,A1,A2>
  • No this object, two callee arguments

• RWTFunctor2MImp<S1,S2,Callee,DR,D1,D2>
  • Has this object, but no callee arguments

• RWTFunctor2MA1Imp<S1,S2,Callee,D1,D2,DR,A1>
  • Has this object, one callee arguments

• RWTFunctor2MA2Imp<S1,S2,Callee,DR,D1,D2,A1,A2>
  • Has this object, two callee arguments These concrete classes are templatized on the signature of the function that is encapsulated, as well as the signature of the functor invocation.

The template parameters describe the invocation signature of the functor and the function call it encapsulates. These parameters are:

• S1      The type of the first functor signature argument

• S2      The type of the second functor signature argument

• Callee  The class type that declares a member function

• DR      The return type of the function

• D1      The type of the first function signature argument; the compiler must be able to convert to this from the S1 type.

• D2      The type of the second function signature argument; the compiler must be able to convert to this from the S2 type.

• A1      The type of the first client data argument

• A2      The type of the second client data argument

The make() function is the only member of these functor classes that is intended to be accessed directly; it is often called through one of the rwtMakeFunctor2() convenience mechanisms. All other members must be accessed through an RWTFunctor2<S1,S2> handle.

Examples

 #include <rw/functor/RWTFunctor2GImp.h>
 
 void foo(int,float);
 
 // Create a functor that calls foo():
 RWTFunctor2<int,float> func;
 func = RWTFunctor2GImp<int,float,void,int,float>::make(foo);
 // Invoke functor
 func(7,1.0);

See also:

rwtMakeFunctor2(), RWTFunctor2<S1,S2>