On Thursday, 5 November 2020 at 21:18:52 UTC, Selim Ozel wrote:
auto records = rawtext.csvReader!struct_type1(';');
D is statically typed and `auto` means "deduce this type for me
based on this one function's return value". It is not like
JavaScript's `var` whose type may change.
If I'm not mistaken the `csvReader` function returns a range
struct, and the full type is something long and unwieldy like
`CsvReader!(struct_type1, cast(Malformed)1, string, dchar,
string[])`. So just think of `records` as being that.
(You can tell what type it is at compilation with `pragma(msg,
typeof(records).stringof)`.)
if(aControlCondition) {
records = rawtext.csvReader!struct_type2(';');
Here `csvReader!struct_type2(';')` returns a value of type
`CsvReader!(struct_type2, ...)`, which is a different type from
that of `records` (and they're not implicitly convertible). So
the error message is right. If `auto` worked like `var` your code
would work, but it doesn't.
You need two different variables and two different `foreach`es.
For the same code to work on both types, the easy solution is
templates. Perhaps make the `foreach` part after the reads a
templated function that accepts any type passed to it?
