Re: override toString() for a tuple?
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
Re: override toString() for a tuple?
On Wednesday, 4 June 2014 at 06:04:22 UTC, Jonathan M Davis via Digitalmars-d-learn wrote: toString is a member of Tuple, and there's no way to override that externally. ... Hi Jonathan, Yeah, I'll probably just keep my locally cobbled version of typecons.d in my path. The other options would be hard going as I've got tuples printed from arrays and variant arrays etc as well as individually. It's just easier to hack the default library code, although not so elegant. You would think the promise of OO and Inheritance would make it easy and free us from hacks like this ;) That said, it's only a personal project so as long as it works, who cares? Many Thanks for your reply Steve D
Re: override toString() for a tuple?
On Wed, 04 Jun 2014 06:25:53 + Steve D via Digitalmars-d-learn digitalmars-d-learn@puremagic.com wrote: You would think the promise of OO and Inheritance would make it easy and free us from hacks like this ;) That would require using OO and inheritance, which has nothing to do with Tuple. ;) And actually, I find that I very rarely need inheritance. It's definitely the right solution for some problems, but in the vast majority of cases, I find that structs are a better solution - especially because they're far more composable. OO is actually very bad for code reuse, because it's not particularly composable at all. - Jonathan M Davis
override toString() for a tuple?
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
