Does malloc() always work to increase the size of an array?

If I use malloc() to increase the s开发者_高级运维ize of an array, would that always work, or would I sometimes get a memory error?

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It may be worth mentioning that malloc will not increase the size of existing memory. It allocates new memory. realloc can be used for "increasing" memory, but it is a tricky function at times (it can return a different pointer than the original, and if it fails to allocate new memory the original memory is left unchanged).

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It'll "work" if you have enough memory. If you don't have enough memory, then it will not work.

Now, when I say "work", it depends what you mean by "work". malloc does not increase the size of anything other than your program's memory usage.

Why aren't you using std::vector?

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realloc will return NULL if it fails to allocate memory.

Malloc won't resize an array. And realloc will only do it for a malloc'd one.