spdlog extension example

gistfile1.txt

#include "spdlog/fmt/ostr.h"

class Person {
public:
    Person(string name, int age): name(name), age(age) { }

    template<typename OStream>
    friend OStream &operator<<(OStream &os, const Person& p) {
        return os << "<Person name=" << p.name << ">";
    }

    string name;
    int age;
};