C++17 std::any with std::map

main.cpp

#include <map>
#include <string>
#include <any>
#include <iostream>

std::map<std::string, std::any> ParameterMap;

template <typename T>
bool set_params(const std::string& name, const T& var, bool add_new_key = false) {
    if (ParameterMap.count(name) > 0 || add_new_key) {
        ParameterMap[name.c_str()] = var;
        return true;
    } else {
        return false;
    }
}

template <typename T>
bool get_params(const std::string& name, T& var) {
    for (auto it = ParameterMap.begin(); it != ParameterMap.end(); ++it) {
        if (name.compare(it->first) == 0) {
            var = std::any_cast<T>(it->second);
            return true;
        }
    }
    return false;
}

int main() {
    std::string path{"path.dat"};
    double lowerBound = -10;
    double upperBound = 10;

    set_params("pathFile", path, true);
    ParameterMap["lowerBoundary"] = lowerBound;
    ParameterMap["upperBoundary"] = upperBound;

    std::string strS;
    get_params("pathFile", strS);
    std::cout << strS << std::endl;
    set_params("pathFile", std::string{"path2.dat"});
    get_params("pathFile", strS);
    std::cout << strS << std::endl;
    double x;
    get_params("lowerBoundary", x);
    std::cout << x << std::endl;
}