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adaptation for book and plug demo

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

CallChainOfFunctionPointersWithContext< ContextType > Class Template Reference

Group one or more functions in an instance of a CallChainOfFunctionPointersWithContext, then call them in sequence using CallChainOfFunctionPointersWithContext::call(). More...

#include <CallChainOfFunctionPointersWithContext.h>

Inherits SafeBool< CallChainOfFunctionPointersWithContext< ContextType > >.

Public Types

typedef
FunctionPointerWithContext
< ContextType > * 		pFunctionPointerWithContext_t
 The type of each callback in the callchain.

Public Member Functions

 CallChainOfFunctionPointersWithContext ()
 Create an empty chain.
pFunctionPointerWithContext_t add (void(*function)(ContextType context))
 Add a function at the front of the chain.
template<typename T >
pFunctionPointerWithContext_t add (T *tptr, void(T::*mptr)(ContextType context))
 Add a function at the front of the chain.
pFunctionPointerWithContext_t add (const FunctionPointerWithContext< ContextType > &func)
 Add a function at the front of the chain.
bool detach (const FunctionPointerWithContext< ContextType > &toDetach)
 Detach a function pointer from a callchain.
void clear (void)
 Clear the call chain (remove all functions in the chain).
bool hasCallbacksAttached (void) const
 Check whether the callchain contains any callbacks.
void call (ContextType context)
 Call all the functions in the chain in sequence.
void call (ContextType context) const
 Same as call() above, but const.
void operator() (ContextType context) const
 Same as call(), but with function call operator.
bool toBool () const
 Bool conversion operation.
 operator BoolType_t () const
 Bool operator implementation, derived class has to provide bool toBool() const function.

Protected Types

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

Protected Member Functions

void invalidTag () const
 Non implemented call, use to disallow conversion between unrelated types.
void trueTag () const
 Member function which indicate true value.

Detailed Description

template<typename ContextType>
class CallChainOfFunctionPointersWithContext< ContextType >

Group one or more functions in an instance of a CallChainOfFunctionPointersWithContext, then call them in sequence using CallChainOfFunctionPointersWithContext::call().

Used mostly by the interrupt chaining code, but can be used for other purposes.

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);
     chain.call();
 }

Definition at line 59 of file CallChainOfFunctionPointersWithContext.h.

Member Typedef Documentation

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

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

Definition at line 35 of file SafeBool.h.

typedef FunctionPointerWithContext<ContextType>* pFunctionPointerWithContext_t

The type of each callback in the callchain.

Definition at line 64 of file CallChainOfFunctionPointersWithContext.h.

Constructor & Destructor Documentation

CallChainOfFunctionPointersWithContext (  )

Create an empty chain.

Definition at line 70 of file CallChainOfFunctionPointersWithContext.h.

Member Function Documentation

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

Add a function at the front of the chain.

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

Definition at line 86 of file CallChainOfFunctionPointersWithContext.h.

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

Add a function 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 function object created for tptr and mptr.

Definition at line 101 of file CallChainOfFunctionPointersWithContext.h.

pFunctionPointerWithContext_t add ( const FunctionPointerWithContext< ContextType > &  func )

Add a function at the front of the chain.

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

Definition at line 113 of file CallChainOfFunctionPointersWithContext.h.

void call ( ContextType  context ) const

Same as call() above, but const.

Definition at line 189 of file CallChainOfFunctionPointersWithContext.h.

void call ( ContextType  context )

Call all the functions in the chain in sequence.

Definition at line 182 of file CallChainOfFunctionPointersWithContext.h.

void clear ( void   )

Clear the call chain (remove all functions in the chain).

Definition at line 159 of file CallChainOfFunctionPointersWithContext.h.

bool detach ( const FunctionPointerWithContext< ContextType > &  toDetach )

Detach a function pointer from a callchain.

Parameters:
[in]toDetachFunctionPointerWithContext 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 the chain is traversed by call(ContextType).

Definition at line 128 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 175 of file CallChainOfFunctionPointersWithContext.h.

void invalidTag (  ) const [protected, inherited]

Non implemented call, use to disallow conversion between unrelated types.

operator BoolType_t (  ) const [inherited]

Bool operator implementation, derived class has to provide bool toBool() const function.

Definition at line 100 of file SafeBool.h.

void operator() ( ContextType  context ) const

Same as call(), but with function call operator. 

 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 220 of file CallChainOfFunctionPointersWithContext.h.

bool toBool (  ) const

Bool conversion operation.

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

Definition at line 229 of file CallChainOfFunctionPointersWithContext.h.

void trueTag (  ) const [protected, inherited]

Member function which indicate true value.

Definition at line 45 of file SafeBool.h.

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