Hi all,

I'm porting some C++ code into D that uses istream to read lines like

label 3

where there can spaces or tabs between the 2 fields.  In c++, this is:

string l;
int i;
istr >> l >> i;

What's the equivalent in D?  It appears that D formatted read for strings grabs everything up to a newline and doesn't support whitespace tokenization.

If I do

f.readf("%s %s", &l, &i);

it fails if the whitespace is a tab.

Thanks
Jerry

Jerry:

> If I do
>
> f.readf("%s %s", &l, &i);
>
> it fails if the whitespace is a tab.

In you can use byLine, followed by a split, and then assignment of the pieces, followed by to!int where necessary.

Bye,
bearophile

"bearophile" <bearophileHUGS@lycos.com> writes:

> Jerry:
>
>> If I do
>>
>> f.readf("%s %s", &l, &i);
>>
>> it fails if the whitespace is a tab.
>
> In you can use byLine, followed by a split, and then assignment of the pieces, followed by to!int where necessary.

I actually can't use byLine in this instance.  I'm really wanting the %s
behavior of scanf().

On Tuesday, 17 June 2014 at 13:16:38 UTC, Jerry wrote:
> "bearophile" <bearophileHUGS@lycos.com> writes:
>
>> Jerry:
>>
>>> If I do
>>>
>>> f.readf("%s %s", &l, &i);
>>>
>>> it fails if the whitespace is a tab.
>>
>> In you can use byLine, followed by a split, and then assignment of the pieces,
>> followed by to!int where necessary.
>
> I actually can't use byLine in this instance.  I'm really wanting the %s
> behavior of scanf().

If you really need/want fscanf behaviour then just use it:

import core.stdc.stdio : fscanf;

"John Colvin" <john.loughran.colvin@gmail.com> writes:

> On Tuesday, 17 June 2014 at 13:16:38 UTC, Jerry wrote:
>> "bearophile" <bearophileHUGS@lycos.com> writes:
>>
>>> Jerry:
>>>
>>>> If I do
>>>>
>>>> f.readf("%s %s", &l, &i);
>>>>
>>>> it fails if the whitespace is a tab.
>>>
>>> In you can use byLine, followed by a split, and then assignment of the
>>> pieces,
>>> followed by to!int where necessary.
>>
>> I actually can't use byLine in this instance.  I'm really wanting the %s
>> behavior of scanf().
>
> If you really need/want fscanf behaviour then just use it:
>
> import core.stdc.stdio : fscanf;

Thanks, I forgot the obvious.

It would be nice to have a way to do the same thing in D formatted reading.  Does it seem like it would be useful to specify this kind of thing?

For example, you could have:

%' '         grabs all isWhite() chars
%t           reads a single token - all chars !isWhite()

Any takers?

Jerry