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Disable length when taking from a lengthless range

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Fix #79.
This commit is contained in:
Eugen Wissner
2018-11-13 08:29:51 +01:00
parent 9e6f5c3105
commit 0a121d9d19
3 changed files with 81 additions and 3 deletions
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23
source/tanya/algorithm/iteration.d
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@ -23,6 +23,7 @@ module tanya.algorithm.iteration;
import tanya.algorithm.comparison;
import tanya.algorithm.mutation;
import tanya.range;
version (unittest) import tanya.test.range;
private struct Take(R, bool exactly)
{
@ -73,13 +74,16 @@ private struct Take(R, bool exactly)
}
else
{
return length == 0 || this.source.empty;
return this.length_ == 0 || this.source.empty;
}
}
@property size_t length()
static if (exactly || hasLength!R)
{
return this.length_;
@property size_t length()
{
return this.length_;
}
}
static if (hasAssignableElements!R)
@ -315,6 +319,19 @@ if (isInputRange!R)
assert(t.empty);
}
// length is unknown when taking from a range without length
@nogc nothrow pure @safe unittest
{
@Empty
static struct R
{
mixin InputRange;
}
auto actual = take(R(), 100);
static assert(!hasLength!(typeof(actual)));
}
/**
* Takes exactly $(D_PARAM n) elements from $(D_PARAM range).
*