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util/ForeignFifoBuffer: add method MoveFrom()

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Max Kellermann 2014-08-07 08:53:02 +02:00
parent 69ae879c58
commit 2beb763b4f
1 changed files with 16 additions and 0 deletions
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16
src/util/ForeignFifoBuffer.hxx
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@ -204,6 +204,22 @@ public:
return n;
}
/**
* Move as much data as possible from the specified buffer.
*
* @return the number of items moved
*/
size_type MoveFrom(ForeignFifoBuffer<T> &src) {
auto r = src.Read();
auto w = Write();
size_t n = std::min(r.size, w.size);
std::move(r.data, r.data + n, w.data);
Append(n);
src.Consume(n);
return n;
}
protected:
void Shift() {
if (head == 0)