example_listbox.cpp

#include <nana/gui.hpp>
#include <nana/gui/widgets/listbox.hpp>
#include <iostream> 

int main()
{
        using namespace nana;
        form fm;
        listbox lb(fm, nana::rectangle(10, 10, 280, 120));

        lb.append_header("Header", 200);

    // this will attemp to use   
    // item_proxy cat_proxy::append (T &&t, bool set_value=false) 
    // to add a value any of char[4]  = "int"
        
    lb.at(0).append({"int"});
    lb.at(0).append({"double"});

        lb.anyobj(0, 0, 10);    
        lb.anyobj(0, 1, 0.1);   

        int * pi = lb.anyobj<int>(0, 0);          // it returns a nullptr if there is not an int object specified.
    std::cout << "Index: (0,0) -> int value: " << *pi << std::endl; 

        double * pd = lb.anyobj<double>(0, 1); // it returns a nullptr if there is not an double object specified.
    std::cout << "Index: (0,1) -> double value: " << *pd; 

        fm.show();
        exec();
}