Thread: Memory reallocation in C++

  1. #1
    Registered User
    Join Date
    Dec 2005

    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:

    int *x= new int[10];
    x=new int[20];
    it will keep the first values I enter?

  2. #2
    The larch
    Join Date
    May 2006
    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.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  3. #3
    System Novice siavoshkc's Avatar
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    We recently had a thread on it.
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