• via Digitalmars-d-bugs (38/38) May 13 2014 https://issues.dlang.org/show_bug.cgi?id=12743

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=12743

          Issue ID: 12743
           Summary: tuple printing of alias names
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: Phobos
          Assignee: nobody puremagic.com
          Reporter: bearophile_hugs eml.cc

void main() {
    import std.stdio, std.typecons;
    static struct Pair1 { int x, y; }
    auto a1 = [Pair1(1, 2), Pair1(3, 4)];
    a1.writeln;
    alias Pair2 = Tuple!(int, int);
    auto a2 = [Pair2(1, 2), Pair2(3, 4)];
    a2.writeln;
    alias Pair3 = Pair2;
    auto a3 = [Pair3(1, 2), Pair3(3, 4)];
    a3.writeln;
}


Outout with DMD 2.066alpha:

[Pair1(1, 2), Pair1(3, 4)]
[Tuple!(int, int)(1, 2), Tuple!(int, int)(3, 4)]
[Tuple!(int, int)(1, 2), Tuple!(int, int)(3, 4)]


But I'd like an output like this, is it possible?

[Pair1(1, 2), Pair1(3, 4)]
[Pair2(1, 2), Pair2(3, 4)]
[Pair3(1, 2), Pair3(3, 4)]


If that's not possible then we could add a tuple alternative constructor that
accepts the name (similar to Python collections.namedtuple), used only by
write/format to print a nice tuple name:

alias Pair4 = NamedTuple!("Pair4", int, int);

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