Hi,

I have a problem with malloc function.
I am using mallog in the manner:

TMyClass *ClInstancePtr;

CInstancePtr=(TMyClass*) malloc(sizeof(TMyClass)*NumOfElements);

And it doesn't work properly. It behaves just lke I hadn't allocated anything.
F ex.:

ClInstance[2]=some values;
cout<<ClInstance<<endl;
output - some random data.

What am I doing wrong?

Thanks in advance for any help.
Regards,
Misery.

PS.: When I use new[ ]/delete [ ] it works fine.

Using malloc doesn't construct any object in the array, it only allocates the requested memory.

Why do you need to use malloc instead of new[]?

Why do you need to use malloc instead of new[]?

Because I want to have possibility to resize my data without copying it.
How to make an array in place of malloc?

[quote name='vdaras' timestamp='1309616091' post='4830346']
Why do you need to use malloc instead of new[]?

Because I want to have possibility to resize my data without copying it.
How to make an array in place of malloc?
[/quote]

Use stl containers instead, it will save you a lot of bother. However, for the sake of explanation... you'll have to copy the data over anyway as malloc will allocate memory at a DIFFERENT address to the one you got when you first called malloc, thus you will lose the data. Not only that, but it will be leaked memory as you didn't free it before reallocating new memory. Anyway, use the new and delete operators as they are the "proper way of doing things", and for good reason. To allocate and delete arrays, you use new[] and delete[] operators respectively. If you wish to resize a dynamically created array, you would allocate a temporary dynamic array of existing size and then copy the contents of your existing array across. Then you would delete the contents of your existing array and reallocate a new array of the desired size, before transferring the contents of your temporary array across. Finally, delete you would the temporary array.

Use std::vector and you are golden.

Why not stl?
Does something like vector<bool> tell You guys something?
Thats why not stl.

Does something like vector<bool> tell You guys something?

I'm not following. You can have containers of objects, no problem.