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Your assumption that pure virtual function cannot be called is absolutely incorrect. When a function is declared pure virtual, it simply means that this function cannot get called dynamically, through a virtual dispatch mechanism. Yet, this very same function can easily be called statically, without virtual dispatch.

In C++ language static call to a virtual function is performed when a qualified name of the function is used in the call, i.e. when the function name specified in the call has the <class name>::<function name> form.

For example

struct S {
      virtual void foo() = 0; }; void S::foo() { // body for the pure virtual function `S::foo` } struct D : S { void foo() { S::foo(); // static call to `S::foo` from derived class } }; int main() { D d; d.S::foo(); // another static call to `S::foo` }

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