Re: how to iterate on Array?

[aki via Digitalmars-d-learn]

On Sunday, 28 June 2015 at 10:16:47 UTC, Marc Schütz wrote:

On Saturday, 27 June 2015 at 17:43:13 UTC, aki wrote:

But when I compile it by DMD 2.062 on Windows
it says:

testArray.d(5): Error: cannot infer argument types
(line 5 is at foreach(i, v; a[]) { )


2.062 is really ancient, we're about to release 2.068 soon. 
Consider upgrading, because there have been tons of bugfixes 
since your version.


On current DMD, the error message is slightly clearer:

Error: cannot infer argument types, expected 1 argument, not 2


Ah, you answered my another question.
Even if I put all the types like foreach(size_t i, int v; a[])
he still said cannot infer. I wonder why he need to infer?
Now I got it. I'm looking forward 2.068.
Aki.

Re: how to iterate on Array?

[via Digitalmars-d-learn]

On Saturday, 27 June 2015 at 17:43:13 UTC, aki wrote:

But when I compile it by DMD 2.062 on Windows
it says:

testArray.d(5): Error: cannot infer argument types
(line 5 is at foreach(i, v; a[]) { )


2.062 is really ancient, we're about to release 2.068 soon. 
Consider upgrading, because there have been tons of bugfixes 
since your version.


On current DMD, the error message is slightly clearer:

Error: cannot infer argument types, expected 1 argument, not 2

how to iterate on Array?

[aki via Digitalmars-d-learn]

I want to print the contents of Array!int

import std.stdio;
import std.container;

void pr(Array!int a) {
foreach(i, v; a[]) {
writeln(%4s: %s\n, i, v);
}
}

But when I compile it by DMD 2.062 on Windows
it says:

testArray.d(5): Error: cannot infer argument types
(line 5 is at foreach(i, v; a[]) { )

What's wrong? how can I iterate the array?

Thanks, aki.

Re: how to iterate on Array?

[Ali Çehreli via Digitalmars-d-learn]

On 06/27/2015 10:43 AM, aki wrote:

 void pr(Array!int a) {
  foreach(i, v; a[]) {

You are rightly assuming that the loop counter is available for all 
container types. Unfortunately, it is the case only for arrays.


Luckily, it is very easy to achieve it with std.algorithm.enumerate:

import std.stdio;
import std.container;
import std.range;

void pr(Array!int a) {
foreach(i, v; a[].enumerate) {
writeln(%4s: %s\n, i, v);
}
}

void main()
{
auto a = Array!int();
pr(a);
}

Ali

Re: how to iterate on Array?

[John Chapman via Digitalmars-d-learn]

On Saturday, 27 June 2015 at 17:43:13 UTC, aki wrote:

I want to print the contents of Array!int

import std.stdio;
import std.container;

void pr(Array!int a) {
foreach(i, v; a[]) {
writeln(%4s: %s\n, i, v);
}
}

But when I compile it by DMD 2.062 on Windows
it says:

testArray.d(5): Error: cannot infer argument types
(line 5 is at foreach(i, v; a[]) { )

What's wrong? how can I iterate the array?

Thanks, aki.


size_t i;
foreach (v; a[])
  writeln(%s: %s, i++, v);

Re: how to iterate on Array?

[jmh530 via Digitalmars-d-learn]

On Saturday, 27 June 2015 at 18:32:10 UTC, Ali Çehreli wrote:


Luckily, it is very easy to achieve it with std.range.enumerate:



FTFY

Re: how to iterate on Array?

[aki via Digitalmars-d-learn]

On Saturday, 27 June 2015 at 18:32:10 UTC, Ali Çehreli wrote:

On 06/27/2015 10:43 AM, aki wrote:
You are rightly assuming that the loop counter is available for 
all container types. Unfortunately, it is the case only for 
arrays.


Now I know. Thanks for it.
aki.