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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-10-07 22:39:19 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-10-13 20:37:44 +0300
commit764ff6fdf3145868d8b6f91c6a93072d7b86ecaf (patch)
tree0d2c7d31043ce62ef3569eb813dcec459160d22a /Documentation/coding-style.rst
parentabe2c1b55c788873ee1a24dc207cad82f931a48e (diff)
libcamera: v4l2_device: Avoid copy of V4L2ControlInfo
The V4L2Device::listControls() method creates an instance of V4L2ControlInfo and then inserts it in the device's list of controls. The insertion uses std::map::emplace(), but passes the V4L2ControlInfo, resulting in a copy being performed (using the copy constructor of V4L2ControlInfo). Optimise this by really constructing the V4L2ControlInfo in-place. The use of std::piecewise_construct is required for gcc-5 that seems to have trouble with std::map::emplace() on non-copyable values in this case. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Jacopo Mondi <jacopo@jmondi.org> Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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