Comment #0 by qigezx+dc40d6nao940k — 2024-09-20T13:14:28Z
InputRange.take(n).filter.chain logically transforms it into InputRange.filter.take(n-1).chain and thus takes the wrong number of elements
Example:
----
import std.stdio;
import std.algorithm;
import std.range;
auto inputRangeFactory(){
int i = 0;
int gen(){
return i++;
}
return generate!gen();
}
void main(){
// [10, 11, 12, 13, 14, 15, 16, 17, 18, 100]
inputRangeFactory.take(10).filter!"a>8".chain(only(100)).writeln;
// Unless filter would discard all taken elements
// [100]
inputRangeFactory.take(10).filter!"a>9".chain(only(100)).writeln;
// Adding "array" somewhere in the middle fixes it
// [9,100]
inputRangeFactory.take(10).array.filter!"a>8".chain(only(100)).writeln;
inputRangeFactory.take(10).filter!"a>8".array.chain(only(100)).writeln;
}
------
$ dmd --version
DMD64 D Compiler v2.109.1
Copyright (C) 1999-2024 by The D Language Foundation, All Rights Reserved written by Walter Bright
Comment #1 by robert.schadek — 2024-12-01T16:43:00Z