• via Digitalmars-d-bugs (34/34) Jul 11 2014 https://issues.dlang.org/show_bug.cgi?id=13099

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

https://issues.dlang.org/show_bug.cgi?id=13099

          Issue ID: 13099
           Summary:  nogc std.range.stride
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: Phobos
          Assignee: nobody puremagic.com
          Reporter: bearophile_hugs eml.cc

void main()  nogc {
    import std.range: stride;
    int[] a;
    a.stride(2);
}


dmd 2.066beta gives:

test.d(4,13): Error:  nogc function 'D main' cannot call non- nogc function
'std.range.stride!(int[]).stride'


Currently std.range.stride is not  nogc just because of this enforce:


auto stride(Range)(Range r, size_t n)  nogc
if (isInputRange!(Unqual!Range))
{
    import std.exception : enforce;

    enforce(n > 0, "Stride cannot have step zero.");
...



The given code compiles if you replace the enforce with:


    immutable static exc = new Exception("Stride cannot have step zero.");
    if (n == 0)
        throw exc;



But look at the comment by monarchdodra in Issue 12768 .

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