[libgpiod][PATCH 07/16] bindings: cxx: allow to copy line_settings

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Implement the copy operator for line_settings. We have a copy() method
for line settings in C API while in C++ it's useful to copy line_settings
returned in an std::map from line_config.get_line_settings().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 bindings/cxx/gpiodcxx/line-settings.hpp    | 13 ++++++-
 bindings/cxx/internal.hpp                  |  2 +-
 bindings/cxx/line-settings.cpp             | 28 ++++++++++++++
 bindings/cxx/tests/tests-line-settings.cpp | 43 ++++++++++++++++++++++
 4 files changed, 83 insertions(+), 3 deletions(-)

diff --git a/bindings/cxx/gpiodcxx/line-settings.hpp b/bindings/cxx/gpiodcxx/line-settings.hpp
index c1477b1..c18dc52 100644
--- a/bindings/cxx/gpiodcxx/line-settings.hpp
+++ b/bindings/cxx/gpiodcxx/line-settings.hpp
@@ -38,7 +38,11 @@ public:
 	 */
 	line_settings();
 
-	line_settings(const line_settings& other) = delete;
+	/**
+	 * @brief Copy constructor.
+	 * @param other Object to copy.
+	 */
+	line_settings(const line_settings& other);
 
 	/**
 	 * @brief Move constructor.
@@ -48,7 +52,12 @@ public:
 
 	~line_settings();
 
-	line_settings& operator=(const line_settings& other) = delete;
+	/**
+	 * @brief Copy assignment operator.
+	 * @param other Object to copy.
+	 * @return Reference to self.
+	 */
+	line_settings& operator=(const line_settings& other);
 
 	/**
 	 * @brief Move assignment operator.
diff --git a/bindings/cxx/internal.hpp b/bindings/cxx/internal.hpp
index d27aa22..6aceac1 100644
--- a/bindings/cxx/internal.hpp
+++ b/bindings/cxx/internal.hpp
@@ -120,7 +120,7 @@ struct info_event::impl
 struct line_settings::impl
 {
 	impl();
-	impl(const impl& other) = delete;
+	impl(const impl& other);
 	impl(impl&& other) = delete;
 	impl& operator=(const impl& other) = delete;
 	impl& operator=(impl&& other) = delete;
diff --git a/bindings/cxx/line-settings.cpp b/bindings/cxx/line-settings.cpp
index 5ded953..32f21a3 100644
--- a/bindings/cxx/line-settings.cpp
+++ b/bindings/cxx/line-settings.cpp
@@ -86,6 +86,15 @@ line_settings_ptr make_line_settings()
 	return settings;
 }
 
+line_settings_ptr copy_line_settings(const line_settings_ptr& ptr)
+{
+	line_settings_ptr settings(::gpiod_line_settings_copy(ptr.get()));
+	if (!settings)
+		throw_from_errno("Unable to copy the line settings object");
+
+	return settings;
+}
+
 template<class key_type, class value_type, class exception_type>
 value_type map_setting(const key_type& key, const ::std::map<key_type, value_type>& mapping)
 {
@@ -136,12 +145,24 @@ line_settings::impl::impl()
 
 }
 
+line_settings::impl::impl(const impl& other)
+	: settings(copy_line_settings(other.settings))
+{
+
+}
+
 GPIOD_CXX_API line_settings::line_settings()
 	: _m_priv(new impl)
 {
 
 }
 
+GPIOD_CXX_API line_settings::line_settings(const line_settings& other)
+	: _m_priv(new impl(*other._m_priv))
+{
+
+}
+
 GPIOD_CXX_API line_settings::line_settings(line_settings&& other) noexcept
 	: _m_priv(::std::move(other._m_priv))
 {
@@ -153,6 +174,13 @@ GPIOD_CXX_API line_settings::~line_settings()
 
 }
 
+GPIOD_CXX_API line_settings& line_settings::operator=(const line_settings& other)
+{
+	this->_m_priv.reset(new impl(*other._m_priv));
+
+	return *this;
+}
+
 GPIOD_CXX_API line_settings& line_settings::operator=(line_settings&& other)
 {
 	this->_m_priv = ::std::move(other._m_priv);
diff --git a/bindings/cxx/tests/tests-line-settings.cpp b/bindings/cxx/tests/tests-line-settings.cpp
index a3f4bc5..dc821bb 100644
--- a/bindings/cxx/tests/tests-line-settings.cpp
+++ b/bindings/cxx/tests/tests-line-settings.cpp
@@ -124,6 +124,49 @@ TEST_CASE("line_settings mutators work", "[line-settings]")
 	}
 }
 
+TEST_CASE("line_settings can be moved and copied", "[line-settings]")
+{
+	::gpiod::line_settings settings;
+
+	settings
+		.set_direction(direction::INPUT)
+		.set_edge_detection(edge::BOTH);
+
+	SECTION("copy constructor works")
+	{
+		auto copy(settings);
+		settings.set_direction(direction::OUTPUT);
+		settings.set_edge_detection(edge::NONE);
+		REQUIRE(copy.direction() == direction::INPUT);
+		REQUIRE(copy.edge_detection() == edge::BOTH);
+	}
+
+	SECTION("assignment operator works")
+	{
+		::gpiod::line_settings copy;
+		copy = settings;
+		settings.set_direction(direction::OUTPUT);
+		settings.set_edge_detection(edge::NONE);
+		REQUIRE(copy.direction() == direction::INPUT);
+		REQUIRE(copy.edge_detection() == edge::BOTH);
+	}
+
+	SECTION("move constructor works")
+	{
+		auto copy(::std::move(settings));
+		REQUIRE(copy.direction() == direction::INPUT);
+		REQUIRE(copy.edge_detection() == edge::BOTH);
+	}
+
+	SECTION("move assignment operator works")
+	{
+		::gpiod::line_settings copy;
+		copy = ::std::move(settings);
+		REQUIRE(copy.direction() == direction::INPUT);
+		REQUIRE(copy.edge_detection() == edge::BOTH);
+	}
+}
+
 TEST_CASE("line_settings stream insertion operator works", "[line-settings]")
 {
 	::gpiod::line_settings settings;
-- 
2.37.2