Write a program to access the function "foo" using the structure structure2. typedef struct { int *a; char (*fptr)(char*); }structure1; typedef struct { int x; structure1 *ptr; }structure2; char foo(char * c) { --- --- --- } ...
I have a method pointer like below: typedef void (MMsnInternalCallBacks::* FuncPtr)(); FuncPtr iSoapActionComplete; I call the method below through the pointer iSoapActionComplete like below: (iCallbacks.*iSoapActionComplete)( ); While the function is being called a message "Memory Full. Try closing some applications" flashes on my...
Hi, In a C lib, there is a function waiting a function pointer such that: lasvm_kcache_t* lasvm_kcache_create(lasvm_kernel_t kernelfunc, void *closure) where lasvm_kernel_t is defined as: typedef double (*lasvm_kernel_t)(int i, int j, void* closure); Now, if I send a method defined in a class to lasvm_kcache_create: double cls_las...
I understand I can use pointers for functions. Can someone explain why one would use them, and how? Short example code would be very helpful to me. ...
Bear with me as I dump the following simplified code: (I will describe the problem below.) class CMyClass { ... private: HRESULT ReadAlpha(PROPVARIANT* pPropVariant, SomeLib::Base *b); HRESULT ReadBeta(PROPVARIANT* pPropVariant, SomeLib::Base *b); typedef HRESULT (CMyClass::*ReadSignature)(PROPVARIANT* pPropVariant, SomeLib::Bas...
My question is really more about scope in JavaScript, rather then closures. Let's take the following code: var f = function () { var n = 0; return function () { return n++; }; }(); console.log(f()); console.log(f()); The above code outputs: 0 1 As you can see from the above code, f (self-invoked) returns a function, creating...
Hi all.. i am working in embedded C environment.. can we pass function pointer as an argument to a function in C? if so, can u give me a sample declaration and definition.. thnx in advance ...
(C++) I have a sanitization function that I want to run on (traditional) pointer types only. My problem is with function templates I can get as far as limiting the function to only pointers, however because of casting rule differences between function pointers and regular pointers, I run into problems. The Sanitize() function needs ...
I have a pointer to my char array like this. unsigned char *recvBuf; recvBuf = (unsigned char *)malloc(sizeof(char)*RECVBUF); I then pass that to a function defined as void setHeader(MyHeader *myHeader, unsigned char *buffer) Which copies the first 12 bytes into a struct Then I try and pass it to another function later on ...
If I use the inline function in matlab I can create a single function name that could respond differently depending on previous choices: if (sometimes) p = inline('a - b','a','b'); else p = inline('a + b','a','b'); end c = p(1,2); d = p(3,4); But the inline functions I'm creating are becoming quite epic, so I'd like to move them ...
I'm attempting to make a messaging system in which any class derived from "Messageable" can receive messages based on how the function handleMessage() is overloaded. For example: class Messageable { public: void takeMessage(Message& message) { this->dispatchMessage(message); } prot...
This is the provided function template I'm trying to use: template <class Process, class BTNode> void postorder(Process f, BTNode* node_ptr) { if (node_ptr != 0) { postorder( f, node_ptr->left() ); postorder( f, node_ptr->right() ); f( node_ptr->data() ); } } This is my call, and the function I'm passing: v...
I need to call a method that expects a function pointer, but what I really want to pass to it is a functor. Here's an example of what I'm trying to do: #include <iostream> #include "boost/function.hpp" typedef int (*myAdder)(int); int adderFunction(int y) { return(2 + y); } class adderClass { public: adderClass(int x) : _x(x) ...
what is the difference between these two below: typedef void (*my_destructor)(void *); typedef void (*my_destructor)(void *) my_func_ptr; is the second one valid? ...
How can I call a function in file1.as from file2.as? here is the code. package com.modestmaps { import com.modestmaps.overlays.MarkerClip; import flash.display.Graphics; import flash.display.Loader; import flash.display.Shape; import flash.display.Sprite; import flash.filters.BlurFilter; import flash...
I've try to compile this code: #include <iostream> #include <cstdlib> using namespace std; #define ARRAY_TAM 2 typedef int (*operacion)(int, int); typedef const char* (*Pfchar)(); int suma(int, int); int resta(int, int); const char* descrSuma(); const char* descrResta(); const char* simbSuma(); const char* simbResta(); class OP { ...
Let's say there is an imaginary operating system... There is a function in it called settime that gets a pointer to function and a timestamp. The catch is that every time the function is called it runs over the last call (so only the new function being provided as parameter will be called). I want to expose a new function to my users ...
I've got some C code I'm targeting for an AVR. The code is being compiled with avr-gcc, basically the gnu compiler with the right backend. What I'm trying to do is create a callback mechanism in one of my event/interrupt driven libraries, but I seem to be having some trouble keeping the value of the function pointer. To start, I have ...
Suppose I have these three functions: bool A(); bool B(); bool C(); How do I call one of these functions conditionally using a function pointer, and how do I declare the function pointer? ...
When implementing polymorphic behavior in C++ one can either use a pure virtual method or one can use function pointers (or functors). For example an asynchronous callback can be implemented by: Approach 1 class Callback { public: Callback(); ~Callback(); void go(); protected: virtual void doGo() = 0; }; //Constructo...