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
