How can you manually manage memory in C++?

Question

C++ / C#

Here there is a dynamic allocation of memory through new

int* arr[10] = new int[10];
int* year = new int(2016);

Is it possible to somehow independently implement the new class? But how is it all arranged in pluses, at the compiler level, I would like to independently place any information in the cells, but how, could you demonstrate your own code examples? Thank you.

Answer 1

I would like to independently place any information in the cells

What for? For fun?
You can write a simple class with a couple of private fields and public getters/setters, compile it with the g++ compiler, and then take IDA Pro with Hex-Rays and decompile the getters and setters. You will get a code consisting of only calls to cells, fields - these are memory cells, a getter or setter takes a pointer to a class (that is, an address in memory), adds a certain offset (a certain number) to the address - and gets a cell, into a cell you can write or read data, for example, you can assign the address of a string (char *) to it ... Moreover, the offset is always a constant, so another program can intrude into yours (with the help of hooks, on Android they are done using Cydia), and interact as part of it ...
In my opinion - very cool ...
А еще есть WriteProcessMemory/ReadProcessMemory, тоже прикольная штука...