`std::variant` (Automatic Virtual Dispatch Using Template Method)¶

Overview ¶

Much like std::variant (Manual Virtual Dispatch, Using std::visit)
Using template method in visitor

Virtual Access ¶

code/variant-automatic-visit/virtual.h¶

#pragma once

struct get_temperature_visitor
{
    double operator()(auto& s)                         // <--- abbreviated function template
    { 
        return s.get_temperature();
    }
};

static inline double get_temperature(Sensor& s)
{
    return std::visit(get_temperature_visitor(), s);
}