[libgpiod][PATCH v3 0/3] libgpiod v2: C++ bindings

[Bartosz Golaszewski <brgl@xxxxxxxx>]

This series contains the implementation of the C++ bindings for libgpiod v2.
In general the C++ library follows the data structure model as defined by
the C library with one notable exception: objects that represent immutable
snapshots of kernel data (line_info and edge & info events) are copyable
(or rather shared behind the scenes using ::std::shared_ptr). The rest of
the classes delete their copy constructors and assignment operators and
are only move constructible and move assignable.

All classes follow the pimpl idiom - using either shared_ptr or unique_ptr -
and all implementations are hidden from the user for easier maintenance and
less ABI breakage in the future.

The edge_event class is a bit of a special case. While it looks the same
as other copyable objects to the user, the implementation uses a tiny bit of
polymorphism (although it never crosses the ABI boundary). This is done
to make it possible to use the edge_event_buffer without any memory
allocations like what the C API enables. The edge_event objects stored
in the buffer only contain a raw pointer to the C object stored in the
underlying C edge_event_buffer. The event is copied into a fully managed
object once the copy assignment operator is called.

I'm Cc'ing people who showed interest and helped me with C++ bindings
before for review.

v1 -> v2:
Kent: I addressed most points from your review. Some are unaddressed due to
personal preference (for instance: I still allow creating of empty line-request
objects as they may be reused in subsequent requests). I also kept the 'watch'
argument in get_line_info() as well as the boolean operators for chip and
request - although with (hopefully) better documentation.

v2 -> v3:
- use scoped class enums instead of regular integer ones
- rename getters to get_<property>() in order to avoid name conflicts with
  the new enum types

The first two patches extend the core C API of libgpiod as discussed.

Bartosz Golaszewski (3):
  API: add a function for retrieving the capacity of edge event buffers
  API: extend the line request functionality
  bindings: cxx: implement C++ bindings for libgpiod v2.0

 Doxyfile.in                                 |   4 +-
 bindings/cxx/Makefile.am                    |  16 +-
 bindings/cxx/chip.cpp                       | 214 +++--
 bindings/cxx/edge-event-buffer.cpp          | 103 +++
 bindings/cxx/edge-event.cpp                 | 123 +++
 bindings/cxx/examples/Makefile.am           |  12 +-
 bindings/cxx/examples/gpiodetectcxx.cpp     |   9 +-
 bindings/cxx/examples/gpiofindcxx.cpp       |   2 +-
 bindings/cxx/examples/gpiogetcxx.cpp        |  12 +-
 bindings/cxx/examples/gpioinfocxx.cpp       |  63 +-
 bindings/cxx/examples/gpiomoncxx.cpp        |  39 +-
 bindings/cxx/examples/gpiosetcxx.cpp        |  19 +-
 bindings/cxx/gpiod.hpp                      | 938 +-------------------
 bindings/cxx/gpiodcxx/Makefile.am           |  14 +
 bindings/cxx/gpiodcxx/chip.hpp              | 180 ++++
 bindings/cxx/gpiodcxx/edge-event-buffer.hpp | 115 +++
 bindings/cxx/gpiodcxx/edge-event.hpp        | 125 +++
 bindings/cxx/gpiodcxx/info-event.hpp        | 108 +++
 bindings/cxx/gpiodcxx/line-config.hpp       | 250 ++++++
 bindings/cxx/gpiodcxx/line-info.hpp         | 209 +++++
 bindings/cxx/gpiodcxx/line-request.hpp      | 207 +++++
 bindings/cxx/gpiodcxx/misc.hpp              |  49 +
 bindings/cxx/gpiodcxx/request-config.hpp    |  97 ++
 bindings/cxx/info-event.cpp                 |  89 ++
 bindings/cxx/internal.hpp                   | 168 +++-
 bindings/cxx/iter.cpp                       |  60 --
 bindings/cxx/line-config.cpp                | 226 +++++
 bindings/cxx/line-info.cpp                  | 150 ++++
 bindings/cxx/line-request.cpp               | 194 ++++
 bindings/cxx/line.cpp                       | 321 -------
 bindings/cxx/line_bulk.cpp                  | 366 --------
 bindings/cxx/misc.cpp                       |  18 +
 bindings/cxx/request-config.cpp             |  80 ++
 configure.ac                                |   1 +
 include/gpiod.h                             |  63 +-
 lib/edge-event.c                            |   6 +
 lib/line-request.c                          |  50 +-
 tools/gpioget.c                             |   3 +-
 38 files changed, 2854 insertions(+), 1849 deletions(-)
 create mode 100644 bindings/cxx/edge-event-buffer.cpp
 create mode 100644 bindings/cxx/edge-event.cpp
 create mode 100644 bindings/cxx/gpiodcxx/Makefile.am
 create mode 100644 bindings/cxx/gpiodcxx/chip.hpp
 create mode 100644 bindings/cxx/gpiodcxx/edge-event-buffer.hpp
 create mode 100644 bindings/cxx/gpiodcxx/edge-event.hpp
 create mode 100644 bindings/cxx/gpiodcxx/info-event.hpp
 create mode 100644 bindings/cxx/gpiodcxx/line-config.hpp
 create mode 100644 bindings/cxx/gpiodcxx/line-info.hpp
 create mode 100644 bindings/cxx/gpiodcxx/line-request.hpp
 create mode 100644 bindings/cxx/gpiodcxx/misc.hpp
 create mode 100644 bindings/cxx/gpiodcxx/request-config.hpp
 create mode 100644 bindings/cxx/info-event.cpp
 delete mode 100644 bindings/cxx/iter.cpp
 create mode 100644 bindings/cxx/line-config.cpp
 create mode 100644 bindings/cxx/line-info.cpp
 create mode 100644 bindings/cxx/line-request.cpp
 delete mode 100644 bindings/cxx/line.cpp
 delete mode 100644 bindings/cxx/line_bulk.cpp
 create mode 100644 bindings/cxx/misc.cpp
 create mode 100644 bindings/cxx/request-config.cpp

-- 
2.30.1