MQL5 - operator new -> what for?

Quoting michx

Disliked

Hi, I'm just pondering what operator new in MQL5 is for if i can't use it to allocate dynamic array? Could u tell me examples when should i use pointer and operator new to create object instead create local variable? For example if i have class like this: class myClass{}; when should i do: myClass* ptr_to_obj_of_my_class = new myClass; //dynamic variable and when just: myClass my_class; //local variable ? thanks in advance!

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Quoting michx

Disliked

Hi Halley, Thank You for your answear. However i'm confused, because in my opinion there is no different between loses object or loses pointer to object. I mean i have to save one of tham always (oryginal object or pointer to it). for example if I do object inside a function and create local variable i have to return this object if i want save it. But if i do pointer and make an object by operator new i have to return this pointer to have connect with this object. Otherwise i lose this object too. In this connection there is no different ;/ have...

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ExpertManager* manager;
void OnInit() {
   manager = new ExpertManager();
   manager.onInit();
}
void OnDeinit(const int reason) {
   manager.onDeinit(reason);
   delete manager;
}

ExpertManager manager; //global object
void OnInit() {
manager.onInit();
}
void OnDeinit(const int reason) {
manager.onDeinit(reason);
}

Quoting michx

Disliked

I don't see any differents yet, because You can do something like this: ExpertManager manager; //global object void OnInit() { manager.onInit(); } void OnDeinit(const int reason) { manager.onDeinit(reason); }

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ExpertManager* manager;
void OnInit() {
 manager = new MyExpertManager();
 manager.onInit();
}
void OnDeinit(const int reason) {
 manager.onDeinit(reason);
 delete manager;
}

ExpertManager* getManager() {
 return new MyExpertManager();
}
void something() {
    ExpertManager* manager = getManager();
    ...
   delete manager;
}

MyExpertManager manager;
void OnInit() {
 manager.onInit();
}
void OnDeinit(const int reason) {
 manager.onDeinit(reason);
}

MyExpertManager getManager() {
MyExpertManager manager;
 return manager;
}
void something() {
 MyExpertManager manager = getManager();
 ...
}

Quoting michx

Disliked

Heh, but u can do like this: MyExpertManager manager; void OnInit() { manager.onInit(); } void OnDeinit(const int reason) { manager.onDeinit(reason); } or next case MyExpertManager getManager() { MyExpertManager manager; return manager; } void something() { MyExpertManager manager = getManager(); ... } ;-) It's hard

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