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Merge pull request #2582 from monarchdodra/cacheBug

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Tweak cache constructor
This commit is contained in:
H. S. Teoh 2014-10-03 07:54:48 -07:00
commit 95222b884d
1 changed files with 15 additions and 2 deletions
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17
std/algorithm.d
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@ -877,6 +877,19 @@ unittest
auto d = c[0 .. 1]; auto d = c[0 .. 1];
} }
unittest
{
static struct Range
{
bool initialized = false;
bool front() @property {return initialized = true;}
void popFront() {initialized = false;}
enum empty = false;
}
auto r = Range().cache();
assert(r.source.initialized == true);
}
private struct Cache(R, bool bidir) private struct Cache(R, bool bidir)
{ {
import core.exception : RangeError; import core.exception : RangeError;
@ -901,9 +914,9 @@ private struct Cache(R, bool bidir)
source = range; source = range;
if (!range.empty) if (!range.empty)
{ {
caches[0] = range.front; caches[0] = source.front;
static if (bidir) static if (bidir)
caches[1] = range.back; caches[1] = source.back;
} }
} }