Configuration variant

variant.cpp

#include <iostream>
#include <map>
#include <string>
#include <variant>
#include <vector>

struct ConfValue;
using ConfObject = std::map<std::string, ConfValue>;
using ConfArray = std::vector<ConfValue>;

/**
* Represents a configuration value.
*/
struct ConfValue {
    std::variant<std::monostate, ConfObject, ConfArray, std::string, long long, double, bool> v;
};

/**
* Configuration (format influenced by JSON).
*/
int main() {
    std::map<std::string, ConfValue> default_conf = {
        {"port", ConfValue{1LL}},
        {"module", ConfValue{"modHeader"}},
        {"modulePath", ConfValue{ConfArray{ConfValue{"../modules/"}, ConfValue{"./modules"}}}}
    };
    // default_conf["port"] = ConfValue{std::string{"hjjl;"}};
    auto intPtr = std::get_if<std::string>(&default_conf["port"].v);
    std::string val = intPtr ? *intPtr : "default";
    std::cout << val << std::endl;
}