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Using each member of class within one function to calculate average


Using each member of class within one function to calculate average

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Using each member of class within one function to calculate average
Tag : cpp , By : GunnarHafdal
Date : November 25 2020, 01:01 AM


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Creating a class member pointer function variable that points to a non-static class member function


Tag : cpp , By : Bharath
Date : March 29 2020, 07:55 AM
Does that help The goal is to have the member variable _AddValue point to the CreateFirstValue function upon class initialization and after the first invocation of AddValue, all future calls to it will invoke CreateAnotherValue. ,
&CreateAnotherValue
&Foo::CreateAnotherValue
(this->*_AddValue)(whatever);

The base class member function access child class member function directly?


Tag : android , By : Lee KW
Date : March 29 2020, 07:55 AM
help you fix your problem
How does the base class BnSurfaceTexture know the function "requestBuffer"?
class Base
{
public:
    virtual void f() { /* Base */ } // could be pure virtual
    virtual void g() { f(); };
};

class Derived: public Base
{
public:
    virtual void f() { /* derived */ }
};
Base* pB = new Derived;
pB->g();

How to order below code : a class member function calling a non-member function with class argument?


Tag : cpp , By : Deepak Poondi
Date : March 29 2020, 07:55 AM
Hope that helps It might be better to illustrate the problem with below code: , You can forward-declare structs and classes. So:
struct Sales_data;
std::istream& read(std::istream& is, Sales_data& item);

Javascript class member function calling member function by setInterval, couldn't access member variable


Tag : javascript , By : Viv
Date : March 29 2020, 07:55 AM
I hope this helps . setInterval() doesn't work with this. See here: https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers/setInterval#The_this_problem
function job_queue(){
    this.job = null;
    this.pointer = this.job;
    this.job_dispatcher = null; 
    this.length = 0;
}
job_queue.prototype.add_job = function( job ){
    if( this.job == null ){
        console.log('1st');
        this.job = {
            job:job,
            next:null
        };
        this.pointer = this.job;
        this.length = 1;
    }else{
        console.log('2nd');
        this.pointer.next = { 
            job:job,
            next:null
        };
        this.pointer = this.pointer.next;
        this.length++;
    }
};

job_queue.prototype.event_handler = function(){
        
        if( typeof this.job['job'] == 'undefined'){
            console.log('??');
        }
        if( this.job.job != null ){
            console.log('hi');
            this.job.job();
            this.job = this.job.next();
        }

}

job_queue.prototype.start_dispatch = function(){
    var self = this;
    if( this.job_dispatcher == null ){
        console.log( this.event_handler );
        this.job_dispatcher = setInterval( function(){self.event_handler()},1000);
    }
}



var jq = new job_queue();
function a(){
    console.log('hi');
};
function b(){
    console.log('hi2');
}
jq.add_job(a);
jq.add_job(b);
jq.add_job(a);
jq.start_dispatch();

Invalid use of non-static member function - Class Member Function Calling Another Class Member Function


Tag : cpp , By : Matt Croydon
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further void(*task_main)() is expecting a pointer to a function. You attempt to feed it void otherMain(); which is a class method and has a hidden this parameter.
This stuff gets a little whacky. Here is a great write-up on some of the badness and how to avoid it.
class taskRunner
{
public:
    virtual execute() = 0;
    static void task_runner(void * userparam)
    {
        taskRunner* task = (taskRunner*)userparam;
        task->execute();
    }
};
void otherMain()
{
    printf("Hello multitasking world!"); 
    yield(); // a free function that calls into the system's TaskManager to preempt
}
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