UniquePrintable objekt – C / C++ – Fórum – Programujte.com

https://quuxplusone.github.io/blog/2020/11/24/type-erased-printable/

https://www.youtube.com/watch?v=tbUCHifyT24

#include "unique_printable.h"  // see https://quuxplusone.github.io/blog/2020/11/24/type-erased-printable/
struct arrItem {
    int key;
    UniquePrintable item1;
    UniquePrintable item2;
};

int main()
{
    std::vector<arrItem> DataList;
    DataList.push_back({ 0, 101, 102.10 });
    DataList.push_back({ 1, 201, 202 });
    DataList.push_back({ 2, 301, "hello world" });  // just for fun
    for (auto& [key, item1, item2] : DataList) {
        std::cout << "key: " << key << "; item1: " << item1 << "; item2: " << item2 << "\n";
    }
}
Here is the C++17 code all worked out, and executing correctly, on Godbolt.
https://godbolt.org/z/bdPTT7oeo