#include <cppscript>

var growth_rate(var tree) { return tree["height"]/tree["age"]; }

void grow(var tree, var height) { tree["height"] += height; }

var tree(var species, var height, var age)
{
	var tree = object();
	tree["species"] = species;
	tree["height"] = height;
	tree["age"] = age;
	tree["growth_rate"] = growth_rate; // Equivalent to bind(growth_rate, tree);
	tree["grow"] = grow; // Equivalent to bind(grow, tree)
	return tree;
}

var script_main(var args)
{
	var oak = tree("oak", 10, 2);
	writeln( oak["growth_rate"]() ); // 5
	oak["grow"](2);
	writeln( oak["growth_rate"]() ); // 6
	return 0;
}