Ah yes, I understand. Thanks.
For the sake of cleanliness (and Walter's article on component
programming ;) ), is there a way to treat a file as an InputRange
of characters? I think this is quite a common use case.
On Sunday, 7 October 2012 at 19:32:12 UTC, Ali Çehreli wrote:
On 10/07/2012 11:21 AM, Rene Zwanenburg wrote:
> Hi,
>
> To my understanding, The csv reader in std.csv is able to
operate on any
> kind of input range.
The error message took me to the definition of the function.
The template constraints require that the element type of the
range must be a dchar:
// ...
if(isInputRange!Range && is(ElementType!Range == dchar)
// ...
In your case, the element type of byLine() is a string. (I
think.)
> However I can only get it to work on strings.
> Please take a look at the following line of code. Did I make
some mistake?
>
> auto reader = csvReader!(Tuple!(int, int,
float))(someFile.byLine());
>
> When I try to compile that, the compiler output is:
>
> main.d(24): Error: template std.csv.csvReader does not match
any
> function template declaration
> C:\D\dmd2\windows\bin\..\..\src\phobos\std\csv.d(283): Error:
template
> std.csv.csvReader cannot deduce template function from
argument types
> !(Tuple!(int,int,float))(ByLine!(char,char))
> main.d(24): Error: template instance
csvReader!(Tuple!(int,int,float))
> errors instantiating template
>
> As a workaround I could use readText, but that's dirty and
won't work
> for large csv files.
If deneme.txt contains this:
1,2,3.5
6,7,8.5
This works:
import std.stdio;
import std.csv;
import std.typecons;
void main()
{
auto someFile = File("deneme.txt");
foreach (line; someFile.byLine()) {
auto reader = csvReader!(Tuple!(int, int, float))(line);
foreach (record; reader) {
writeln(record);
}
}
}
Ali
