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CallChainOfFunctionPointersWithContext< ContextType > Class Template Reference
Public Types | Public Member Functions | Protected Types | Protected Member Functions

CallChainOfFunctionPointersWithContext< ContextType > Class Template Reference
[Common]

Function like object hosting a list of FunctionPointerWithContext. More...

#include <CallChainOfFunctionPointersWithContext.h>

Inherits SafeBool< CallChainOfFunctionPointersWithContext< ContextType > >.

Public Types

typedef
FunctionPointerWithContext
< ContextType > * 		pFunctionPointerWithContext_t
 Alias of the FunctionPointerWithContext type this object can store.

Public Member Functions

 CallChainOfFunctionPointersWithContext ()
 Create an empty callchain.
virtual ~CallChainOfFunctionPointersWithContext ()
 Destruction of the callchain.
pFunctionPointerWithContext_t add (void(*function)(ContextType context))
 Add a function pointer at the front of the chain.
template<typename T >
pFunctionPointerWithContext_t add (T *tptr, void(T::*mptr)(ContextType context))
 Add a member function bound to its instance at the front of the chain.
pFunctionPointerWithContext_t add (const FunctionPointerWithContext< ContextType > &func)
 Add a FunctionPointerWithContext at the front of the chain.
bool detach (const FunctionPointerWithContext< ContextType > &toDetach)
 Detach a function pointer from a callchain.
void clear (void)
 Remove all functions registered in the chain.
bool hasCallbacksAttached (void) const
 Check whether the callchain contains any callbacks.
void call (ContextType context)
 Call sequentially each member of the chain.
void call (ContextType context) const
 Call sequentially each member of the chain.
void operator() (ContextType context) const
 Call sequentially each member of the chain.
bool toBool () const
 Test if the callchain is empty or not.
 operator BoolType_t () const
 Bool operator implementation, derived class must provide a bool toBool() const function.

Protected Types

typedef void(base::* BoolType_t )() const
 The bool type is a pointer to method that can be used in boolean context.

Protected Member Functions

void invalidTag () const
 Nonimplemented call, use to disallow conversion between unrelated types.
void trueTag () const
 Special member function that indicates a true value.

Detailed Description

template<typename ContextType>
class CallChainOfFunctionPointersWithContext< ContextType >

Function like object hosting a list of FunctionPointerWithContext.

Upon call, each FunctionPointerWithContext instance present in the object will be called in sequence with the initial parameters.

It can be seen as a variation of the observer pattern this object being the observable, instances of the FunctionPointerWithContext being the observable and the notify/update operation being the function call.

Example: 

 CallChainOfFunctionPointersWithContext<void *> chain;

 void first(void *context) {
     printf("'first' function.\n");
 }

 void second(void *context) {
     printf("'second' function.\n");
 }

 class Test {
 public:
     void f(void *context) {
         printf("A::f (class member).\n");
     }
 };

 int main() {
     Test test;

     chain.add(second);
     chain.add_front(first);
     chain.add(&test, &Test::f);

     // will print:
     // 'second' function.
     // 'first' function.
     // A::f (class member).
     chain.call();
 }
Note:
memory allocation is used to add new function like objects into the call chain.
Template Parameters:
ContextTypeType of the parameter accepted by the callbacks hosted in the object.

Definition at line 82 of file CallChainOfFunctionPointersWithContext.h.

Member Typedef Documentation

typedef void(base::* BoolType_t)() const [protected, inherited]

The bool type is a pointer to method that can be used in boolean context.

Definition at line 48 of file SafeBool.h.

typedef FunctionPointerWithContext<ContextType>* pFunctionPointerWithContext_t

Alias of the FunctionPointerWithContext type this object can store.

Definition at line 88 of file CallChainOfFunctionPointersWithContext.h.

Constructor & Destructor Documentation

CallChainOfFunctionPointersWithContext (  )

Create an empty callchain.

Definition at line 94 of file CallChainOfFunctionPointersWithContext.h.

virtual ~CallChainOfFunctionPointersWithContext (  ) [virtual]

Destruction of the callchain.

Definition at line 99 of file CallChainOfFunctionPointersWithContext.h.

Member Function Documentation

pFunctionPointerWithContext_t add ( void(*)(ContextType context)  function )

Add a function pointer at the front of the chain.

Parameters:
[in]functionA pointer to a void function.
Returns:
The FunctionPointerWithContext object created from function.

Definition at line 111 of file CallChainOfFunctionPointersWithContext.h.

pFunctionPointerWithContext_t add ( T *  tptr,
void(T::*)(ContextType context)  mptr 
)

Add a member function bound to its instance at the front of the chain.

Parameters:
[in]tptrPointer to the object to call the member function on.
[in]mptrPointer to the member function to be called.
Returns:
The FunctionPointerWithContext object created from tptr and mptr.

Definition at line 126 of file CallChainOfFunctionPointersWithContext.h.

pFunctionPointerWithContext_t add ( const FunctionPointerWithContext< ContextType > &  func )

Add a FunctionPointerWithContext at the front of the chain.

Parameters:
[in]funcThe FunctionPointerWithContext to add.
Returns:
The function object created for func.

Definition at line 138 of file CallChainOfFunctionPointersWithContext.h.

void call ( ContextType  context ) const

Call sequentially each member of the chain.

Parameters:
[in]contextParameter to pass to the functions called.

Definition at line 223 of file CallChainOfFunctionPointersWithContext.h.

void call ( ContextType  context )

Call sequentially each member of the chain.

Parameters:
[in]contextParameter to pass to the functions called.

Definition at line 213 of file CallChainOfFunctionPointersWithContext.h.

void clear ( void   )

Remove all functions registered in the chain.

Definition at line 186 of file CallChainOfFunctionPointersWithContext.h.

bool detach ( const FunctionPointerWithContext< ContextType > &  toDetach )

Detach a function pointer from a callchain.

Parameters:
[in]toDetachFunctionPointerWithContext instance to detach from this callchain.
Returns:
true if a function pointer has been detached and false otherwise.
Note:
It is safe to remove a function pointer while call(ContextType) is traversing the chain.

Definition at line 154 of file CallChainOfFunctionPointersWithContext.h.

bool hasCallbacksAttached ( void   ) const

Check whether the callchain contains any callbacks.

Returns:
true if the callchain is not empty and false otherwise.

Definition at line 203 of file CallChainOfFunctionPointersWithContext.h.

void invalidTag (  ) const [protected, inherited]

Nonimplemented call, use to disallow conversion between unrelated types.

operator BoolType_t (  ) const [inherited]

Bool operator implementation, derived class must provide a bool toBool() const function.

Definition at line 117 of file SafeBool.h.

void operator() ( ContextType  context ) const

Call sequentially each member of the chain.

Parameters:
[in]contextParameter to pass to the functions called.
 void first(bool);
 void second(bool);

 CallChainOfFunctionPointerWithContext<bool> foo;

 foo.attach(first);
 foo.attach(second);

 // call the callchain like a function
 foo(true);

Definition at line 258 of file CallChainOfFunctionPointersWithContext.h.

bool toBool (  ) const

Test if the callchain is empty or not.

Returns:
true if the callchain is not empty and false otherwise.
Note:
used by SafeBool to offer a safe boolean conversion.
 CallChainOfFunctionPointersWithContext<void *> chain;

 if (!chain) {
   // Do something if the chain is empty.
 }

 if (chain) {
   // Do something if the chain is not empty.
 }

Definition at line 283 of file CallChainOfFunctionPointersWithContext.h.

void trueTag (  ) const [protected, inherited]

Special member function that indicates a true value.

Definition at line 58 of file SafeBool.h.

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