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C ++ operator delete []

Is it correct to use the delete [] operator?

int* a=new int[size];
delete[] a;

If so, Who (the compiler or GC or whoever) will determine the size of the newly created array? and where will it store the size of the array?

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For each chunk of memory allocated, the memory allocator stores the chunk size (so it's inefficient to allocate many small chunks versus one large one, for example). When a delete frees memory, the allocator knows how large the memory chunk is pointing to the pointer.



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Technically, this usage is perfectly fair. However, it is generally a bad idea to create new arrays, and you should use std :: vector.



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By the way, every time you are tempted to write new T[size]

, you should most likely use std::vector<T>

. By using local pointers to dynamic arrays, it is simply too difficult to ensure that memory is deallocated correctly in the event of an exception being thrown.
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