Pointer to array of base class, populate with derived class

Question

If I have a base class, with only virtual methods and 2 derived classes from the base class, with those virtual methods implemented.

How do I:

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Answer 1

If your BaseClass contains pure virtual methods, this will fail to compile :

BaseClass* base = new BaseClass[2];

If it doesn't, you are going to get memory leak.

In c++, this is done by using std::vector or std::array, with some kind of smart pointer. For example :

std::vector< std::shared_ptr< BaseClass > > arr( 2 );
arr[0].reset( new FirstDerivedClass() );
arr[1].reset( new SecondDerivedClass() );