[Issue 4666] New: Optional name for std.typecons.Tuples?

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4666

           Summary: Optional name for std.typecons.Tuples?
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2010-08-17 07:31:10 PDT ---
This correct D2 program:

import std.stdio: writeln;
import std.typecons: Tuple;
void main() {
    alias Tuple!(double, "x", double, "y") Point2D;
    writeln(Point2D());
}


Prints (DMD 2.048):
Tuple!(double,"x",double,"y")(nan, nan)


In recent versions of the Python std lib there is collections.namedtuple, that
is similar to std.typecons.Tuple:
http://docs.python.org/dev/library/collections.html#collections.namedtuple

A namedtuple contains a name too, this is handy when they get printed.

So in theory a Tuple may allow an optional name too:


import std.stdio: writeln;
import std.typecons: Tuple;
void main() {
    alias Tuple!("Point2D", double, "x", double, "y") Point2D;
    writeln(Point2D());
}


That may print:
Point2D(nan, nan)


The main difference between the Tuple named 'Point2D' and a normal struct named
'Point2D' is the extra features Tuples have (and will have) over plain structs.

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