ignore lambda parameter

ignore_lambda_param

#include <iostream>
#include <string>

struct ignore_param {
    template <class... Args>
    ignore_param(Args&&...) {}
};

template <class F>
void foo(F&& f)
{
    std::string name = "Akira";
    int age = 27;
    std::string lang = "C++";
    f(name, age, lang);
}

int main()
{
    foo([](const std::string& name, int age, ignore_param) {
        std::cout << name << ", " << age << std::endl;
    });
}

/*
output:
Akira, 27
*/