http://d.puremagic.com/issues/show_bug.cgi?id=10265
Summary: RandomSample fails when passed an InputRange as input
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Joseph Rushton Wakeling <[email protected]>
2013-06-04 06:23:21 PDT ---
By design, RandomSample is supposed to operate on any InputRange:
struct RandomSample(R, Random = void)
if(isInputRange!R && (isUniformRNG!Random || is(Random == void)))
However, RandomSample itself is designed to be a ForwardRange with save()
defined. The save property in turn assumes that the input has save() defined:
@property typeof(this) save()
{
auto ret = this;
ret._input = _input.save;
return ret;
}
The assumption that RandomSample can have save() defined is also problematic
for a second reason: the output from the saved copy will depend on random
numbers, and therefore will not be identical, so it is not clear what the
benefit of a save() function is.
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