[Issue 9857] UFCS for struct opCall

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9857



--- Comment #5 from bearophile_hugs at eml.cc 2013-04-02 13:34:00 PDT ---
(In reply to comment #4)

> I'd even like typeof() to be usable with that trailing syntax, like sizeof, see
> Issue 4272

The U of UFCS means universal. And ctors too are functions. So it's expected.

This silly example of random bigint creation shows why they are handy in UFCS
chains:


import std.stdio, std.bigint, std.algorithm, std.random,
       std.ascii, std.range, std.array;

void main() {
    auto b1 = 20.iota.map!(_ => digits[uniform(0, $)]).array.BigInt;
    b1.writeln;
}


Long UFCS chains are better written in columns, like in F# language:

auto b1 = 20
          .iota
          .map!(_ => digits[uniform(0, $)])
          .array
          .BigInt;


If struct ctors don't support UFCS you have to wrap everything in a BigInt, and
it gets harder to read:

    auto b1 = BigInt(20.iota.map!(_ => digits[uniform(0, $)]).array);


And those columns look bad:

    auto b1 = BigInt(20
                     .iota
                     .map!(_ => digits[uniform(0, $)])
                     .array
                     .BigInt);

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