Memory reallocation in C++

I'm just starting to scratch the surface of c++. I want to know how can you realloc memory in C++. (It is like in C ? use realloc function ?)

if i make:

Code:

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int *x= new int[10];
x=new int[20];

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it will keep the first values I enter?

You'll need to copy the original array over (to another new-ed memory) and free it.

The snippet you have loses the contents of x and creates a memory leak, because you won't be able to delete the memory x pointed to before.

Since all this needs a lot of work and is easy to mess up, many people use std::vector from C++ standard libraries when they need a dynamically resizing array.

We recently had a thread on it.