A more complete example:
//////
var x = (a=1, b=2, c="m");
var y = (c=9.9, s="Hello");
typedef X = (a:int, b:int, c:string);
typedef Y = (c:double, s:string);
typedef XYZ = extend X, Y with (k:string) end;
var xyz:XYZ = extend x,y with (k="world") end;
println$ xyz.a, xyz.b, xyz.c, xyz.s, xyz.k;
println$ "Felix Rocks";
/////
showing displacement of field c from x, and also the mirror image
type syntax.
of course those X,Y,Z types are also expressible as:
interface X { a:int; b:int; c:string; }
interface Y { c:double; s:string; }
interface XYZ extends X,U { k:string; }
which looks more Java like but means exactly the same thing.
However the value extension shows that the "OO" system here
is prototype object based rather than class based.
BTW: here's the generated code for the merger:
PTF x = _art58752(1, 2, ::std::string("m")); //assign
PTF y = _art58754(9.9, ::std::string("Hello")); //assign
PTF xyz = _art58755(PTF x.a, PTF x.b, PTF y.c,
_art58756(::std::string("world")).k, PTF y.s); //assign
Not very efficient. Unchanged by making x,y vals. The compiler isn't so good at
tracking field values (it does some work tracking tuple components).
[PTF means "pointer to thread frame, expands to ptf-> where ptf is a pointer to
the
global storage object called a "thread_frame"]
--
john skaller
skal...@users.sourceforge.net
http://felix-lang.org
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