diff options
| author | Max Kellermann <max@duempel.org> | 2014-03-15 23:29:07 +0100 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2014-03-16 00:28:42 +0100 |
| commit | 328860c8ba572fd9b8032e6ed07704d79f62234e (patch) | |
| tree | af43c49241a2bf8b910008da7e127d70b924541a /src | |
| parent | 89ac111853eb4bae2fc358087c4c4657939321c0 (diff) | |
util/CircularBuffer: add method GetSpace()
Diffstat (limited to 'src')
| -rw-r--r-- | src/util/CircularBuffer.hxx | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/util/CircularBuffer.hxx b/src/util/CircularBuffer.hxx index 0321b91f6..da6f412a5 100644 --- a/src/util/CircularBuffer.hxx +++ b/src/util/CircularBuffer.hxx @@ -108,6 +108,18 @@ public: } /** + * Returns the number of elements that can be added to this + * buffer. + */ + constexpr size_type GetSpace() const { + /* space = capacity - size - 1 */ + return (head <= tail + ? capacity - tail + head + : head - tail) + - 1; + } + + /** * Prepares writing. Returns a buffer range which may be written. * When you are finished, call Append(). */ |