How to do new CArray???

Greg Ellis

Hi Guys, I am having a problem creating a pointer to a CArray structure; CArray<CBackground*, CBackground*>* m_paryBackground; int nNewSize = 2; m_paryBackground = (CArray<CBackground*, CBackground*>*)malloc(nNewSize * sizeof(CArray<CBackground*, CBackground*>*)); m_paryBackground[0] = new CArray<CBackground*, CBackground*>; m_paryBackground[1] = new CArray<CBackground*, CBackground*>; This does not work for some reason. I get a compile time error saying it cannot cast to the m_paryBackground variable. Does anyone know how I can do this properly? I'm using MFC 7 visual studio 2005 Cheers, Greg

PJ Arends

Have you read the documentation for how to use a CArray? The CArray class is an array management class, not a simply C array. Read the docs and use the class' member functions such as SetSize() and SetAt().

Greg Ellis

Yep I have, I am not merely trying to use a CArray I am trying to create a pointer to an array of CArray's. It won't let me do it using malloc for some reason.

PJ Arends

malloc is a C function, not a C++ function. It simply allocates a block of memory, nothing more. You need to use new which allocates a block of memory and then calls the class' c'tor.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

Christian Graus

You should never use malloc in C++. You should also prefer to use std::vector over CArray, as it is standard and it is more flexible/powerful.

Christian Graus - Microsoft MVP - C++ Metal Musings - Rex and my new metal blog "I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Greg Ellis

ok, but I need to dynamically allocate memory so I wanted to be able to use realloc. Is there a realloc equivilent for new? Thanks

PJ Arends

Why? CArray takes care of all the memory allocations itself. There is no need for you to worry about it.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

Michael Dunn

Something like this?

size_t nNewSize = 2;
CArray<CBackground*, CBackground*>* m_paryBackground = new CArray<CBackground*, CBackground*>[nNewSize];

In the future, you should include the compiler error you are getting so we don't have to guess.

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