[Issue 7668] New: std.algorithm.reduce of array of const ints too
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Wed Mar 7 20:09:35 PST 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7668
Summary: std.algorithm.reduce of array of const ints too
Product: D
Version: D2
Platform: x86
OS/Version: Windows
Status: NEW
Keywords: rejects-valid
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: nobody at puremagic.com
ReportedBy: bearophile_hugs at eml.cc
--- Comment #0 from bearophile_hugs at eml.cc 2012-03-07 20:09:38 PST ---
import std.algorithm: reduce;
void main() {
const data = [2, 3, 4];
int r1 = reduce!q{a * b}(0, data); // OK
int r2 = reduce!q{a * b}(data); // error
}
DMD 2.059head gives:
...\dmd2\src\phobos\std\algorithm.d(731): Error: can only initialize const
member _field_field_0 inside constructor
...\dmd2\src\phobos\std\conv.d(3334): Error: *chunk is not mutable
...\dmd2\src\phobos\std\algorithm.d(743): Error: template instance
std.conv.emplace!(const(int),const(int)) error instantiating
test.d(5): instantiated from here: reduce!(const(int[]))
test.d(5): Error: template instance std.algorithm.reduce!("a *
b").reduce!(const(int[])) error instantiating
I think reduce!q{a*b}(data) too should compile and work.
--------------
Extra note: in std.algorithm.reduce there is also this (now bug 2443 is fixed)
at about line 723:
// For now, just iterate using ref to avoid unnecessary copying.
// When Bug 2443 is fixed, this may need to change.
foreach(ref elem; r)
{
if(initialized)
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