From 10a156752be0b938a0808ad144371774d88574a5 Mon Sep 17 00:00:00 2001
From: Bartosz Golaszewski <bartekgola@gmail.com>
Date: Mon, 19 Feb 2018 11:01:01 +0100
Subject: [PATCH] bindings: cxx: provide methods for releasing requested lines

Add release methods to line and line_bulk classes. This allows to
release requested lines without having to destroy the owning objects.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
---
 bindings/cxx/gpiod.hpp     | 10 ++++++++++
 bindings/cxx/line.cpp      |  9 +++++++++
 bindings/cxx/line_bulk.cpp | 11 +++++++++++
 3 files changed, 30 insertions(+)

diff --git a/bindings/cxx/gpiod.hpp b/bindings/cxx/gpiod.hpp
index 5710d36..efa15f2 100644
--- a/bindings/cxx/gpiod.hpp
+++ b/bindings/cxx/gpiod.hpp
@@ -345,6 +345,11 @@ public:
 	 */
 	GPIOD_API void request(const line_request& config, int default_val = 0) const;
 
+	/**
+	 * @brief Release the line if it was previously requested.
+	 */
+	GPIOD_API void release(void) const;
+
 	/**
 	 * @brief Check if this user has ownership of this line.
 	 * @return True if the user has ownership of this line, false otherwise.
@@ -592,6 +597,11 @@ public:
 	GPIOD_API void request(const line_request& config,
 			       const std::vector<int> default_vals = std::vector<int>()) const;
 
+	/**
+	 * @brief Release all lines held by this object.
+	 */
+	GPIOD_API void release(void) const;
+
 	/**
 	 * @brief Read values from all lines held by this object.
 	 * @return Vector containing line values the order of which corresponds
diff --git a/bindings/cxx/line.cpp b/bindings/cxx/line.cpp
index 6603ef7..05f77fc 100644
--- a/bindings/cxx/line.cpp
+++ b/bindings/cxx/line.cpp
@@ -102,6 +102,15 @@ void line::request(const line_request& config, int default_val) const
 	bulk.request(config, { default_val });
 }
 
+void line::release(void) const
+{
+	this->throw_if_null();
+
+	line_bulk bulk({ *this });
+
+	bulk.release();
+}
+
 bool line::is_requested(void) const
 {
 	this->throw_if_null();
diff --git a/bindings/cxx/line_bulk.cpp b/bindings/cxx/line_bulk.cpp
index 106c307..3ce8d94 100644
--- a/bindings/cxx/line_bulk.cpp
+++ b/bindings/cxx/line_bulk.cpp
@@ -129,6 +129,17 @@ void line_bulk::request(const line_request& config, const std::vector<int> defau
 					  "error requesting GPIO lines");
 }
 
+void line_bulk::release(void) const
+{
+	this->throw_if_empty();
+
+	::gpiod_line_bulk bulk;
+
+	this->to_line_bulk(::std::addressof(bulk));
+
+	::gpiod_line_release_bulk(::std::addressof(bulk));
+}
+
 ::std::vector<int> line_bulk::get_values(void) const
 {
 	this->throw_if_empty();
-- 
2.30.2