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Tweak cache constructor

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monarchdodra 2014-10-03 16:08:46 +02:00
parent 4ae1b147a3
commit 282fc0189e
1 changed files with 15 additions and 2 deletions
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17
std/algorithm.d
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@ -871,6 +871,19 @@ unittest
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)
{
import core.exception : RangeError;
@ -895,9 +908,9 @@ private struct Cache(R, bool bidir)
source = range;
if (!range.empty)
{
caches[0] = range.front;
caches[0] = source.front;
static if (bidir)
caches[1] = range.back;
caches[1] = source.back;
}
}