C ++中是否有纯抽象类？

Question

There is a homework question which asks what construct in C++ is similar to a Java interface. An interface in Java can be referred to as a pure abstract class, and I know that C++ has abstract classes, but are pure abstract classes something that C++ officially has ?

Maybe from a C++ designer's viewpoint it doesn't, but technically it is possible to create an pure abstract class in C++ by making all methods abstract right?

I looked at this resource but I'm still confused after reading some of the answers...

Answer 1

Yes you can create an abstract class in c++

class A {

public:
    A() {};
    virtual ~A(){};
    virtual void temp() = 0;
};

int main () {
    A a; // compiler error
}

Answer 2

class Foo {
public:
    Foo();
    virtual ~Foo() {};
    virtual void bar() = 0;
}

Foo is a pure abstract class in C++ because it contains the method bar() which is a pure virtual method.