On Wed, 04 Jun 2014 05:35:18 +
Steve D via Digitalmars-d-learn digitalmars-d-learn@puremagic.com
wrote:
Is it possible to override std tuple's toString format?
so that
auto a = tuple(hello,1,2,3);
writeln(a);
prints
(hello, 1, 2, 3)
and not
Tuple!(string, int, int, int)(hello, 1, 2, 3)
I'm aware I could write a custom formatter function, but it would
be nice not to
have to use such a function for every tuple printed by the
program.
Overriding toString() one time in program (if possible) would
give the ideal default behaviour. (I would duplicate the current
typecons.d toString() and strip off the prefix)
thanks for any help
toString is a member of Tuple, and there's no way to override that externally.
You could create a wrapper struct for a Tuple whose toString method did what
you want, and you could just create a function which generated the string that
you wanted that you used whenever printing out a Tuple, but there is no way to
globally override Tuple's toString.
The closest that you could do to overriding Tuple's toString in one place
would be to write your own wrappers for whatever printing functions you want
to use, have them detect when they're given a Tuple, and then print them the
way that you want and pass everything else directly on to writeln or whatever
it is you're wrapping. Then, the print functions would take care of it for
you, but writing such a function wouldn't exactly be fun.
If you're really determined to print tuples differently, you _could_ simply
copy std.typecons.Tuple to your own code and alter it to do what you want.
- Jonathan M Davis