How does the compiler/program deduces the size of memory to be deleted(released) in case of delete[] arr;

Asked Apr 16 '20 at 14:04

Active Apr 16 '20 at 14:04

Viewed 24 times

When using operator new we explicitly provide the size of memory to be allocated:

int* arr = new int[100];

But when deleting, we just type delete []arr;
How does the compiler/program calculates the size of arr, as we provide no information about it to operator delete?

asked Apr 16 '20 at 14:04

Eduard Rostomyan

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It is implementation defined. Frequently, `allocate` function stores the allocated amount just prior to the pointed data. – ALX23z Apr 16 '20 at 14:07
The memory manager keeps notes. – Pete Becker Apr 16 '20 at 15:29

How does the compiler/program deduces the size of memory to be deleted(released) in case of delete[] arr;

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