• via Digitalmars-d-bugs (44/44) Jun 11 2014 https://issues.dlang.org/show_bug.cgi?id=12893

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=12893

          Issue ID: 12893
           Summary: Cannot create a SortedRange from inout array
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Phobos
          Assignee: nobody puremagic.com
          Reporter: David.L.Watkins gmail.com

import std.algorithm;
import std.array;
import std.range;

struct Data
{
    string name;
    alias name this;
}

inout(Data) findData(inout(Data)[] arr, string name)
{
    auto sorted = assumeSorted(arr);
    auto found = sorted.equalRange(name);
    return found.empty ? Data.init : found.front;
} 

void main()
{
    Data[] arr;
    arr ~= Data("Alice");
    arr ~= Data("Carol");
    arr ~= Data("Bob");
    sort(arr);
    auto data = findData("Bob");
}


Fails with:

\src\phobos\std\range.d(8340): Error: variable
std.range.SortedRange!(inout(Data)[], "a < b").SortedRange._input only
parameters or stack based variables can be inout
\src\phobos\std\range.d(8839): Error: template instance
std.range.SortedRange!(inout(Data)[], "a < b") error instantiating
        instantiated from here: assumeSorted!("a < b", inout(Data)[])

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