I have similar issue and I beleive I was able to workaround that
somehow, but it is so many years now :(. Have you tried enum dataLookup
instead of immutable string[string] dataLookup
Dne 21.2.2017 v 22:53 Chad Joan via Digitalmars-d-learn napsal(a):
Hello all,
I'm trying to make this work:
---
pure string[string] parseTwoColumnCsv(string inputCsv)
{
import std.csv;
import std.typecons;
string[string] result;
foreach ( record; csvReader!(Tuple!(string,string))(inputCsv) )
result[record[0]] = record[1];
return result;
}
immutable string[string] dataLookup =
parseTwoColumnCsv(import("some_data.csv"));
void main()
{
import std.stdio;
writefln("dataLookup = %s", dataLookup);
}
---
But (with DMD 2.073.1) I am getting this error:
main.d(14): Error: non-constant expression [['a', 'b', 'c']:['x', 'y',
'z'], ['1', '2', '3']:['4', '5', '6']]
The case with normal (non-associative) arrays seems to work fine, but
is not what I needed:
---
pure string[][] parseTwoColumnCsv(string inputCsv)
{
import std.csv;
import std.typecons;
string[][] result;
foreach ( record; csvReader!(Tuple!(string,string))(inputCsv) )
result ~= [record[0],record[1]];
return result;
}
immutable string[][] dataLookup =
parseTwoColumnCsv(import("some_data.csv"));
void main()
{
import std.stdio;
writefln("dataLookup = %s", dataLookup);
}
---
Any idea how I can get this working?
I have tried a couple other things, like having the parseTwoColumnCsv
function return an immutable string[string] and casting 'result' to
that in the return statement, and I also tried just casting the value
returned from parseTwoColumnCsv as it appears in the declaration of
'dataLookup'. I tried std.exception's assumeUnique, but the
function/template signature doesn't seem to support associative arrays.
Thanks.