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util::fifo.queue_length() (nw)

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Not 100% confident about the variable type, and there may still be some debate over the function name (trying to avoid confusion with the length of the container, or with the number of empty slots), so appreciate review/comments.
This commit is contained in:
Patrick Mackinlay 2018-10-16 09:33:35 +07:00
parent 56ae477b84
commit ece4404b69
1 changed files with 11 additions and 0 deletions
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11
src/lib/util/coretmpl.h
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@ -885,6 +885,17 @@ public:
bool full() const { return !m_empty && (m_head == m_tail); }
bool empty() const { return m_empty; }
// number of currently enqueued elements
std::size_t queue_length() const
{
if (m_empty)
return 0;
auto const distance = std::distance(m_head, m_tail);
return (distance > 0) ? distance : (N + distance);
}
void enqueue(T const &v)
{
if (WriteWrap || m_empty || (m_head != m_tail))