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Reference.org
Circular buffer
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<p>In <a href="/facts/Computer_science/lN3pEyPz">computer science</a>, a circular buffer, circular queue, cyclic buffer or ring buffer is a <a href="/facts/Data_structure/yNsNvL1I">data structure</a> that uses a single, fixed-size <a href="/facts/Buffer_(computer_science)/tVy4j2Dc">buffer</a> as if it were connected end-to-end. This structure lends itself easily to buffering <a href="/facts/Data_stream/57yDhBCd">data streams</a>. There were early circular buffer implementations in hardware. </p>