Why is std.algorithm so complicated to use?

Andrei Alexandrescu SeeWebsiteForEmail at erdani.org
Tue Jul 10 06:45:10 PDT 2012

On 7/10/12 3:48 AM, Jonathan M Davis wrote:
> On Monday, July 09, 2012 16:16:42 Andrei Alexandrescu wrote:
>>> Another example:
>>> auto str = ["foo", "bar"].map!(x =>  x);
>>> auto f = str.sort();
>>> Results in:
>>> http://pastebin.com/BeePWQk9
>> The first error message is at clear as it goes:
>> Error: r[i2] is not an lvalue
> It's only clear if you go look at sort's implementation, and that failure
> isn't even in sort itself! It's in its helper function, swapAt. Either sort's
> template constraint should fail when it's given a range that won't work with
> it, or it needs a static assertion which tells the programmer exactly what's
> wrong. The fact that r[i2] isn't an lvalue means nothing without actually
> digging into the code, which the average programmer should not have to do.

Agreed, thanks for the bug reports.


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