[libgpiod] bindings: cxx: mark public classes as final

diff --git a/bindings/cxx/gpiodcxx/chip-info.hpp b/bindings/cxx/gpiodcxx/chip-info.hpp
index ebaf396..b6bd0f8 100644
--- a/bindings/cxx/gpiodcxx/chip-info.hpp
+++ b/bindings/cxx/gpiodcxx/chip-info.hpp
@@ -27,7 +27,7 @@  class chip;
 /**
  * @brief Represents an immutable snapshot of GPIO chip information.
  */
-class chip_info
+class chip_info final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/chip.hpp b/bindings/cxx/gpiodcxx/chip.hpp
index 2eaf155..2553f8c 100644
--- a/bindings/cxx/gpiodcxx/chip.hpp
+++ b/bindings/cxx/gpiodcxx/chip.hpp
@@ -38,7 +38,7 @@  class request_config;
 /**
  * @brief Represents a GPIO chip.
  */
-class chip
+class chip final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/edge-event-buffer.hpp b/bindings/cxx/gpiodcxx/edge-event-buffer.hpp
index ff4d238..025517f 100644
--- a/bindings/cxx/gpiodcxx/edge-event-buffer.hpp
+++ b/bindings/cxx/gpiodcxx/edge-event-buffer.hpp
@@ -34,7 +34,7 @@  class line_request;
  * buffer which improves the performance by avoiding needless memory
  * allocations.
  */
-class edge_event_buffer
+class edge_event_buffer final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/edge-event.hpp b/bindings/cxx/gpiodcxx/edge-event.hpp
index 648165c..4fde561 100644
--- a/bindings/cxx/gpiodcxx/edge-event.hpp
+++ b/bindings/cxx/gpiodcxx/edge-event.hpp
@@ -30,7 +30,7 @@  class edge_event_buffer;
 /**
  * @brief Immutable object containing data about a single edge event.
  */
-class edge_event
+class edge_event final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/exception.hpp b/bindings/cxx/gpiodcxx/exception.hpp
index 98b7bc4..e89b384 100644
--- a/bindings/cxx/gpiodcxx/exception.hpp
+++ b/bindings/cxx/gpiodcxx/exception.hpp
@@ -25,7 +25,7 @@  namespace gpiod {
 /**
  * @brief Exception thrown when an already closed chip is used.
  */
-class GPIOD_CXX_API chip_closed : public ::std::logic_error
+class GPIOD_CXX_API chip_closed final : public ::std::logic_error
 {
 public:
 
@@ -61,13 +61,13 @@  public:
 	 */
 	chip_closed& operator=(chip_closed&& other) noexcept;
 
-	virtual ~chip_closed();
+	~chip_closed();
 };
 
 /**
  * @brief Exception thrown when an already released line request is used.
  */
-class GPIOD_CXX_API request_released : public ::std::logic_error
+class GPIOD_CXX_API request_released final : public ::std::logic_error
 {
 public:
 
@@ -103,14 +103,14 @@  public:
 	 */
 	request_released& operator=(request_released&& other) noexcept;
 
-	virtual ~request_released();
+	~request_released();
 };
 
 /**
  * @brief Exception thrown when the core C library returns an invalid value
  *        for any of the line_info properties.
  */
-class GPIOD_CXX_API bad_mapping : public ::std::runtime_error
+class GPIOD_CXX_API bad_mapping final : public ::std::runtime_error
 {
 public:
 
@@ -146,7 +146,7 @@  public:
 	 */
 	bad_mapping& operator=(bad_mapping&& other) noexcept;
 
-	virtual ~bad_mapping();
+	~bad_mapping();
 };
 
 /**
diff --git a/bindings/cxx/gpiodcxx/info-event.hpp b/bindings/cxx/gpiodcxx/info-event.hpp
index 6f3c0b9..e99cbc4 100644
--- a/bindings/cxx/gpiodcxx/info-event.hpp
+++ b/bindings/cxx/gpiodcxx/info-event.hpp
@@ -31,7 +31,7 @@  class line_info;
 /**
  * @brief Immutable object containing data about a single line info event.
  */
-class info_event
+class info_event final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/line-config.hpp b/bindings/cxx/gpiodcxx/line-config.hpp
index b76fdff..8a3335c 100644
--- a/bindings/cxx/gpiodcxx/line-config.hpp
+++ b/bindings/cxx/gpiodcxx/line-config.hpp
@@ -30,7 +30,7 @@  class line_settings;
  * @brief Contains a set of line config options used in line requests and
  *        reconfiguration.
  */
-class line_config
+class line_config final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/line-info.hpp b/bindings/cxx/gpiodcxx/line-info.hpp
index 189d305..26d25a9 100644
--- a/bindings/cxx/gpiodcxx/line-info.hpp
+++ b/bindings/cxx/gpiodcxx/line-info.hpp
@@ -31,7 +31,7 @@  class info_event;
  * @brief Contains an immutable snapshot of the line's state at the
  *        time when the object of this class was instantiated.
  */
-class line_info
+class line_info final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/line-request.hpp b/bindings/cxx/gpiodcxx/line-request.hpp
index f9f0322..54a4e00 100644
--- a/bindings/cxx/gpiodcxx/line-request.hpp
+++ b/bindings/cxx/gpiodcxx/line-request.hpp
@@ -34,7 +34,7 @@  class line_config;
 /**
  * @brief Stores the context of a set of requested GPIO lines.
  */
-class line_request
+class line_request final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/line-settings.hpp b/bindings/cxx/gpiodcxx/line-settings.hpp
index c18dc52..b043167 100644
--- a/bindings/cxx/gpiodcxx/line-settings.hpp
+++ b/bindings/cxx/gpiodcxx/line-settings.hpp
@@ -29,7 +29,7 @@  class line_config;
 /**
  * @brief Stores GPIO line settings.
  */
-class line_settings
+class line_settings final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/request-builder.hpp b/bindings/cxx/gpiodcxx/request-builder.hpp
index d3ada53..3216216 100644
--- a/bindings/cxx/gpiodcxx/request-builder.hpp
+++ b/bindings/cxx/gpiodcxx/request-builder.hpp
@@ -30,7 +30,7 @@  class request_config;
 /**
  * @brief Intermediate object storing the configuration for a line request.
  */
-class request_builder
+class request_builder final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/request-config.hpp b/bindings/cxx/gpiodcxx/request-config.hpp
index 70d179e..b099eb1 100644
--- a/bindings/cxx/gpiodcxx/request-config.hpp
+++ b/bindings/cxx/gpiodcxx/request-config.hpp
@@ -32,7 +32,7 @@  class chip;
  * @brief Stores a set of options passed to the kernel when making a line
  *        request.
  */
-class request_config
+class request_config final
 {
 public:
 
diff --git a/bindings/cxx/gpiodcxx/timestamp.hpp b/bindings/cxx/gpiodcxx/timestamp.hpp
index 5efeb4c..7143ab3 100644
--- a/bindings/cxx/gpiodcxx/timestamp.hpp
+++ b/bindings/cxx/gpiodcxx/timestamp.hpp
@@ -26,7 +26,7 @@  namespace gpiod {
  * @brief Stores the edge and info event timestamps as returned by the kernel
  *        and allows to convert them to std::chrono::time_point.
  */
-class timestamp
+class timestamp final
 {
 public: