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The C++ standard defines a set of C++ standard library headers, and for
some of them, defines C compatibility headers. The former have a name of
the form <cxxx> while the later are named <xxx.h>. The C++ headers
declare names in the std namespace, and may declare the same names in
the global namespace. The C compatibility headers declare names in the
global namespace, and may declare the same names in the std namespace.
We want to standardise on one set of headers through libcamera, and
don't want to rely on optional behaviour. We can thus either use the C++
headers with an explicit std:: namespace qualifier through the code, or
the C headers without the qualifier.
Both set of headers are defined by the C++ standard, and are thus valid
choices. After weighing pros and cons, we have decided to use the C
compatibility headers, as nobody wanted to write std::uint32_t. Document
this decision.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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The documentation style for the Doxygen comment blocks is inconsistent
in the library. Document the expectations and update all existing
comment blocks to match.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
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Using std::move() on return statement of a method or on the its returned
value prevents the compiler from implementing copy-elision. Discourage
that in the coding style document.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
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clang-format produces better results than astyle as it can better match
the libcamera coding style. Default to clang-format over astyle, fall
back to astyle if clang-format isn't found, and add a --formatter
command line option to select a formatter manually.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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Object ownership is a complex topic that can lead to many issues, from
memory leak to crashes. Document the rules that libcamera enforces to
make object ownership tracking explicit.
This is a first version of the rules and is expected to be expanded as
the library is developed.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
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Add the move semantics (move constructor and move assignment) to the
allowed C++11 features, as we extensively use them for the unique and
shared pointers.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
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We make use of the C++11 variadic templates feature in the signal&slot
implementation, mark it as allowed in the coding style documentation.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
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Add a section to the coding style documentation to explain usage of the
checkstyle.py script.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The various lists in the document are not quoted blocks. Don't indent
them.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Add document to summarize the coding style adopted by libcamera.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
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