Are modern C++ compilers able to avoid calling a const function twice under some conditions?

Question

For instance, if I have this code:

class SomeDataProcessor
{
public:
    bool calc(const SomeData & d1, const SomeData & d2) const;
private:
    //Some n         


        

Answer 1

No, the compiler is not allowed to do that in this case. The const only means you do not change the state of the object the method belongs to. However, invoking this method multiple times with the same input parameters might give different results. For example, think of a method that produces a random result.