Re: Using std.conv.to with std.typecons.Typedef

[Saurabh Das via Digitalmars-d-learn]

On Monday, 11 January 2016 at 12:01:30 UTC, Tobi G. wrote:
On Monday, 11 January 2016 at 08:03:19 UTC, Saurabh Das wrote:

How can I get std.conv to understand std.typecons.Typedef?

You can do something like this:

QuestionId q = to!(TypedefType!QuestionId)("43");

In general, is there a better solution to orthogonal types 
than Typedef?

Typedef is a reasonably solution, for this in my opinion.

togrue

Oh excellent. Yes that works for a standalone conversion.  Do you 
know how I can use this with std.csv?

import std.typecons;
alias QuestionId = Typedef!(long, long.init, "QuestionId");
alias StudentId = Typedef!(long, long.init, "StudentId");

struct MyStuff
{
    QuestionId q;
    StudentId s;
}

void main()
{
    import std.csv, std.stdio, std.algorithm, std.range;
    
File("file.csv").byLine.joiner("\n").csvReader!(MyStuff)(null).array;
}

This doesn't work. But if MyStuff is defined as: struct MyStuff { 
int q, s; }, then it works.

Any ideas?