Memory allocation in C++ without the 'new' keyword
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These variables are of scope 'automatic'. The language guarantees that your program will release this storage at the end of the current block. It is probably on the stack, but nothing forces the implementation to use the stack. Bottom line: no leak.
malloc and new will allocate memory on the heap, otherwise the data in placed on the stack. Anything on the heap will need to be manually freed.
It's also worth noting that malloc and new shoudn't be mixed.
Don't use malloc for class types as this can cause problems.
anything using new should use delete, and anything using new[] should use delete[].
eg
// example of new[] and delete[]
int* ints = new int[10];
...
delete [] ints;
// example of malloc and free
int* ints = static_cast<int*>(malloc(sizeof(int) * 10));
...
free(ints);
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