Re: Get max elemenr over RegexMatch

[ag0aep6g via Digitalmars-d-learn]

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"()

Get max elemenr over RegexMatch

[Andrey via Digitalmars-d-learn]

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_", 
"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.