Subject:

Comments:
: No way to go... just go back and sleep : : I want to use a class composed of all pure virtual functions as like 'interface' in java, but instantiating the interface class is not allowed in C++. like following code. : : in C++, : : class ISampleProvider{ : : virtual CObject getSample() = 0; : : } : : class A : public CObject, public ISampleProvider{ : : method A... : : mehtod B... : : // implementation for ISampleProvider : : CObject getSample(){ : : return m_thisSample; : : } : : } : : void main(){ : : A *a = new A; : : ISampleProvider *sample = : : dynamic_cast<ISampleProvider*>(a); : : if(sample) : : sample.getSample(); // error occurs : : } : : It's so powerful expression in java, but C++ does not support it. I think. : : I wanna know that this is essential feature of C++ or another exprssion or technique exists. : : thank you.