Exception throw in visitors

exception_visitor.cpp

#include <stdexcept>

class IName
{
public:
    virtual const std::string& name() const = 0;
};

class EqualNode: public IName

{
public:
    const std::string& name() const override
    {
        static std::string name("EqualNode");
        return name;
    }
};

class NotImplemented: public std::invalid_argument
{
public:
    NotImplemented(const IName& visitor, const IName& node):
        std::invalid_argument("Visitor `" + visitor.name() + "` not implemented for node type `"
                              + node.name() + "`")
    {
    }
};

class EvalVisitor: public IName
{
public:
    const std::string& name() const override
    {
        static std::string name("EvalVisitor");
        return name;
    }

    double visit(const EqualNode& node)
    {
        throw NotImplemented(*this, node);
    }
};

#include <iostream>

int main()
{
    EvalVisitor visitor;
    EqualNode node;
    try
    {
        visitor.visit(node);
    }
    catch (const NotImplemented& ex)
    {
        std::cout << ex.what() << std::endl;
    }
}