• Andrey (12/20) Aug 24 2018 I have a RegexMatch array like:
• ag0aep6g (5/8) Aug 24 2018 You're mixing two different notations. It's either

Andrey <saasecondbox yandex.ru> writes:

Hello,
This code produces an error:
auto matches = content.matchAll(pattern);
auto max = matches.maxElement!"a => a.back.to!uint"();

I have a RegexMatch array like:
[["text1234", "1234"], ["zxs432fff", "432"], ["text000_eeee", 
"000"]]

Max element here is 1234.

I apply map function "a => a.back.to!uint" to each Capture -> 
take last hit, convert it to uint and return for comparison.

But compiler says:
template std.algorithm.searching.extremum cannot deduce function 
from argument types !("a => a.back.to!uint", "a > 
b")(RegexMatch!(char[])), candidates are:

I can't understand what it wrong here.

This works:
 matches.map!(a => a.back.to!uint)().maxElement()

I don't want to use this variant because, as I understand, here 
we create a temporary uint array and then search for max element. 
I.e. there is an unnecessary allocation of memory.

ag0aep6g <anonymous example.com> writes:

On 08/24/2018 01:13 PM, Andrey wrote:
 This code produces an error:
 auto matches = content.matchAll(pattern);
 auto max = matches.maxElement!"a => a.back.to!uint"();


You're mixing two different notations. It's either

     matches.maxElement!(a => a.back.to!uint)()

or

     matches.maxElement!"a.back.to!uint"()