104. Destructors-II

Question.5

A class allocates an array and frees it with the wrong delete:

class Pool {
   Sensor* sensors;
public:
   Pool(int n) : sensors(new Sensor[n]) {}
   ~Pool() { delete sensors; }  // Wrong! Should be delete[]
};

What happens when a Pool object is destroyed?

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All Sensor destructors run correctly
Undefined behavior -- delete (without []) on an array does not call destructors for elements 1..n-1 and corrupts the heap
Only the first Sensor destructor runs; the rest are leaked
Compilation error -- type mismatch

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