import std.range : front;
auto xs = ["a", "b"];
auto ys = ["c", "d"];
auto labels = ["e", "f"];
auto aes = Aes!(string[], "x", string[], "y", string[], "label")(xs, ys, labels);
auto nlAes = merge(aes, Aes!(NumericLabel!(string[]), "x",
NumericLabel!(string[]), "y")(NumericLabel!(string[])(aes.x),
NumericLabel!(string[])(aes.y)));
assertEqual(nlAes.x.front[0], 0);
assertEqual(nlAes.label.front, "e");struct Point { double x; double y; string label = "Point"; }
auto pnt = Point( 1.0, 2.0 );
auto merged = DefaultValues.merge( pnt );
assertEqual( merged.x, 1.0 );
assertEqual( merged.y, 2.0 );
assertEqual( merged.colour, "black" );
assertEqual( merged.label, "Point" );
Merge two types by their members.
If it has similar named members, then it uses the second one.
returns a named Tuple (or Aes) with all the members and their values.