Re: Custom type / Typle type formatted reader
And regarding the rest,
I'm curious about reading back user types, without defining a new
seperate method for it, such as structs, unions and tuples,
(although I'm unsure to what extent tuples are really a
user-defined-type).
The other thing just resolved itself;
I was wondering, as slurp kind of already reads tuples from
files, whether or not it's possible to tell it what tuple you
want it to read, instead of redefining a possibly previously
aliased tuple.
It seems now I found a way to do just that . . . I honestly don't
know why this went wrong before, must have made a mistake
somewhere. This now works:
alias Entry = Tuple!(int, "a", char, "b");
Entry[] results = slurp!Entry("temp.txt", "%s %s");
results.writeln;
Im actually kind of surprised it does, as nothing in the
documentation seems to hint to me this makes sense, neither did I
find any example like it elsewhere.
Re: Custom type / Typle type formatted reader
On Thursday, 31 December 2020 at 18:19:54 UTC, Ali Çehreli wrote:
Can you describe it with a piece of code? If the code shows
what the current undesired output is and what you want instead,
perhaps we can find a solution.
Regarding the enum part;
While trying to do this I noticed one cannot use either slurp or
formattedRead to read enums, while it is possible to use
formattedWrite and write to write them.
Strangely enough this was also mentioned in old issue '18051'
(https://forum.dlang.org/thread/mailman.735.1512835762.9493.digitalmars-d-b...@puremagic.com) which should have been resolved.
Example code;
```
import std.stdio;
import std.file : slurp;
import std.format;
import std.typecons;
enum Thing {
A,
B
}
void main() {
File file = File("temp.txt", "r");
foreach (line; file.byLine) {
int integer;
Thing thing;
formattedRead!"%s %s"(line, integer, thing); // crashes with
thing as Thing, works with thing as char.
formattedWrite(stdout.lockingTextWriter, "%s %s\n", integer,
thing);
}
}
```
Re: Custom type / Typle type formatted reader
On 12/31/20 8:36 AM, Rekel wrote: 樂I'm either asking a stupid question, asking it in a wrong way, or asking an important question. Clueless nontheless. . . Your post was interesting to me but trying to duplicate your situation seemed difficult. Can you describe it with a piece of code? If the code shows what the current undesired output is and what you want instead, perhaps we can find a solution. Ali
Re: Custom type / Typle type formatted reader
樂I'm either asking a stupid question, asking it in a wrong way, or asking an important question. Clueless nontheless. . .
Custom type / Typle type formatted reader
It's more of a multi-part question,
I've been trying to read tuples using 'slurp', though later
realised one of the types was an enum, I'm guessing that's what
was the problem, which lead me down a whole rabbit hole.
- Can I directly read tuples using slurp? It doesnt seem to like
slurp!TUPLE_ALIAS_HERE(etc
- Since slurp can read files into tuples, can I somehow tell
slurp to name the fields?
(For example, I have `alias Instruction = Tuple!(OPERATION,
"operation", int, "argument");`, but I'm not sure if it's
possible to make slurp output one), or alternatively, can I
define it's output tuple 'type'?
- If it's possible to make user types print in certain ways
(https://wiki.dlang.org/Defining_custom_print_format_specifiers),
is it possible to also read them back? Say using formattedRead or
slurp or parse or even to? And if so, how does this work?
- Is it possible to read (formatted) data into enums, as for
example I would like? I wouldnt be surprised if this question
stands loose from the previous one, as it's not entirely the same
situation.
I have an enum;
enum OPERATION {NOP, // Would like to read 'nop' hereto
ACCUMULATE, // 'acc' likewise
JUMP // and 'jmp'
}
