is() now works for tuples

[ghost]

You might want to update Page 177 where you define the isTuple template.

import std.typecons;

template isTuple(T)
{
    static if (is(T tup == Tuple!(InnerTypes), InnerTypes...))  // now works (2.060+ methinks)
        enum isTuple = true;
    else
        enum isTuple = false;
}

void test(T)(T t)
    if (isTuple!T)
{
}

void main()
{
    auto tup = tuple(1, 2);
    test(tup);
}

[PhilippeSigaud]

You're right. A few things changed for the best in template-land since I
wrote this tutorial.

I'm a bit too much occupied by other projects right now, but for this
tutorial I plan to start a small thread on the D forum to get all template
evolutions for 2012.

On the top of my head:

• better is
• better CTFE
• new _traits
• the (a,b)=>a+b syntax seems to work correctly

Any other thing to add?

[ghost]

I have an upcoming fix for this as well: http://d.puremagic.com/issues/show_bug.cgi?id=1673

[PhilippeSigaud]

Man, this one is one of my top 10 D dreams.

[ghost]

Man, this one is one of my top 10 D dreams.

What, the is(symb == template) thing? I thought there might be workarounds by now. Anyway the pull is here:
dlang/dmd#1239

[PhilippeSigaud]

This is asked on the newsgroups at least once a month by people expecting it to work. This is a pull request that'll please many people if it passes.

Of course, it might create subtle bugs, I don't know :)