Dynamic members allocation in qt

» cpp » Dynamic members allocation in qt

By : leahebae

Date : November 25 2020, 07:22 PM

it should still fix some issue If you are able to provide your object with all the necessary data the moment it will be constructed, you should put all initialization in the constructor, for it creates the actual object. This way, you make sure, that your object will be ready when you use it.
If you are not using any special pattern, your getters should not create the objects they return, but rather a reference, as you did in GetCurrentStream().

code :

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Shared members static or dynamic memory allocation C++

By : Cody Masten

Date : March 29 2020, 07:55 AM

This might help you The difference lies between whether you want to share the (member) object between all or some instances of your class.
Static members are shared between all instances, i.e. they are not coupled to instances at all. They exist once and only once (even if there is no instance at all).

dynamic memory allocation,pointer members and destructors

By : ritika

Date : March 29 2020, 07:55 AM

To fix this issue Each time you call new, you have to delete it (except are shared pointers).
So you have to delete the string in the destructor.

Dynamic Allocation for Class members in C++

By : beepee14

Date : March 29 2020, 07:55 AM

it helps some times I am trying to learn POO in C++. I have a problem regarding memory allocation in clases. I want to create a Stack Class. I have this code written in C++ : , You don't find the size of your stack like this:

code :

int n_maxim = sizeof(stackArray) / sizeof(int);

class Stack {
private:
        int *stackArray;
        int topLevel;
        int n_maxim;

public:
        // Constructor without par
        Stack() {
            stackArray = new int[NMAX];
            topLevel = -1; // stiva este NULL la inceput
            n_maxim = NMAX;
        }

       Stack(int array_size) {
            stackArray = new int[array_size];
            topLevel = - 1;
            n_maxim = array_size;
        }
        ...

Dynamic allocation of objects with aligned members - possible solutions?

By : Juanjo Aguilella Mar

Date : March 29 2020, 07:55 AM

should help you out On Windows, malloc is 16-byte aligned (msdn). If your platform malloc has lower alignment requirements, you need to use aligned versions of malloc for objects used by SSE.
EDIT: If you have a specific class of objects that need SSE support you can redefine new/delete for that class only.

Dynamic memory allocation for structure, but what about its int or double members

By : zerdus

Date : March 29 2020, 07:55 AM

should help you out I cannot see any severe errors in your code though reasoning about it would be easier for me if you had written it in English.
As you do malloc(sizeof(rekord)) you allocate memory to hold all members of a rekord. That is three char * pointers, an int and a double. You can write to those members immediately, no further allocation is needed. Of course, writing to a char * member is not really useful unless you are assigning it a pointer to some char buffer which you'd in turn obtain via malloc. For the int and double this is neither needed nor possible. So your code is correct here.