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After p = new Fred[n], how does the compiler know about n objects to be destructed throughout delete[] p?
A: The run-time system hold the number of objects, n, somewhere where it may be retrieved if you know the pointer, p only. There are two famous techniques that do this. Both of these technique are in use trhough commercial-grade compilers, both have tradeoffs, & neither is perfect. These techniques are following:
Over-allocate the array & put n only to the left of the first Fred object. Employ an associative array along with p as the key and n as the value.
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