Is it possible to overload new operator for allocating something like 2d array in C++?

Question

Is it possible to overload global new and global delete operators in C++ for allocation and deallocation of 2d block of memory with given "height" and "width"?

memory isnt 2d, but you can allocate a block of size `width*height` — 463035818_is_not_an_ai, May 07 '20 at 11:49
Sorry, I formulated idea incorrectly. Can I somehow allocate block of size width*height and use it with subscript operators as 2d array? — Azerum, May 07 '20 at 11:55

eerorika · Accepted Answer · 2020-05-07T13:32:46.900

0

Is it possible to overload new operator for allocating something like 2d array in C++?

Yes.

but can I get some code example?

Example:

std::unique_ptr<int[][10]> arr {new int[n][10]};

with given "height" and "width"?

Only if the inner dimensions are compile time constant. Only the outer dimension may be dynamic.

It is easy to translate between a dynamic single dimensional flat array, and a multi dimensional one.

edited May 07 '20 at 13:32

answered May 07 '20 at 11:56

eerorika

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Thank you for your answer, but can I get some code example? – Azerum May 07 '20 at 11:59
@Someone I wrote an example. – eerorika May 07 '20 at 13:33

score 0 · Answer 2 · answered May 07 '20 at 11:58

Unfortunately, the global new operator takes one parameter, so you can not provide it with both "height" and "width". And, the global new/delete operator will be used by not only the code you wrote, but also the library you use, for example std::string, std::vector. So, make such a change may cause nasty problems.

Is it possible to overload new operator for allocating something like 2d array in C++?

2 Answers2