Re: why doesn't formattedRead take args by ref instead of by pointer?

[Dmitry Olshansky]

21-May-2013 01:19, Timothee Cour пишет:

    IRC there was a problem with having a heterogeneous variadic
    (=compiler's type tuple) function to preserve ref-ness.


could you please provide a code snippet demonstrating this?



Here:

void readf(Args...)(const(char)[] fmt, Args args)
{
...
}

the problem was that you couldn't do

void readf(Args...)(const(char)[] fmt, ref Args args)
{
...
}

and have each of args be a 'ref' to original var as there is no such 
things outside function arguments declaration. I dunno how it was solved 
but this now works:

void readf(Args...)(const(char)[] fmt, ref Args args)
{
    foreach(i, v; args)
        args[i] = i;
}

void main(){
    int i, j, k;
    readf("abc", i, j, k);
    assert(i == 0);
    assert(j == 1);
    assert(k == 2);
}

--
Dmitry Olshansky