c++ - what will happen to the alloacted memory in a constructor if I throw exception from constructor? -

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• constructor finishes throwing exception ? there memory leak? 2 answers

if allocating memory pointer using new in constructor , if throw exception after allocating memory form constructor, memory reclaimed or memory leak?

class {     public:         a()         {             p = new int(4);             throw 1;         }          ~a()         {             delete p;         }      private:         int *p; }; 

the memory not reclaimed. if correctly had destructor (and copy/assignment operator) still leak memory.

any constructed sub-objects destructed after throw. in case p destructed, not confused memory pointed p being free: 2 different things , memory in fact leaked.