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Implement filterPending for ConsumableQueue.

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This commit is contained in:
Sönke Ludwig 2018-03-11 19:01:37 +01:00
parent bcf178ef98
commit 3090bc2c7c
1 changed files with 32 additions and 0 deletions
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32
source/eventcore/internal/consumablequeue.d
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@ -235,3 +235,35 @@ unittest {
q.put(i);
assert(q.consume().equal(iota(4)));
}
void filterPending(alias pred, T)(ConsumableQueue!T q)
{
size_t ir = 0;
size_t iw = 0;
while (ir < q.m_pendingCount) {
if (!pred(q.getPendingAt(ir))) {
} else {
if (ir != iw) q.getPendingAt(iw) = q.getPendingAt(ir);
iw++;
}
ir++;
}
q.m_pendingCount = iw;
}
unittest {
import std.algorithm.comparison : equal;
import std.range : only;
auto q = new ConsumableQueue!int;
foreach (i; 0 .. 14) q.put(i);
q.filterPending!(i => i % 2 != 0);
assert(q.consume().equal(only(1, 3, 5, 7, 9, 11, 13)));
foreach (i; 0 .. 14) q.put(i);
q.filterPending!(i => i % 3 == 1);
assert(q.consume().equal(only(1, 4, 7, 10, 13)));
}