examples

commit 9024f9695a499277fd274b713a26bad1994ee2d9
parent f357d93a8859b6ff598392d2fe138550df92e5c6
Author: Henry Wilson <henry@henryandlizzy.uk>
Date:   Thu, 28 Apr 2022 15:53:48 +0000

Add mutex-wrapping container C++ example.

Diffstat:
A
src/mutex_container.cpp
 | 
47
+++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 47 insertions(+), 0 deletions(-)
diff --git a/src/mutex_container.cpp b/src/mutex_container.cpp
@@ -0,0 +1,47 @@
+#include <thread>
+#include <mutex>
+
+template <typename T, typename M = std::mutex>
+struct mutex_container
+{
+	mutex_container() = default;
+
+	struct access
+	{
+		T* operator ->()
+		{
+			return &ref;
+		}
+	private:
+		friend mutex_container;
+		access(M& m, T& r)
+		:   lock(m)
+		,   ref(r)
+		{}
+		std::lock_guard<M> lock;
+		T& ref;
+	};
+
+	access lock()
+	{
+		return {mut, val};
+	}
+
+private:
+	M mut;
+	T val;
+};
+
+struct mystruct
+{
+	int x;
+};
+
+int main()
+{
+	mutex_container<mystruct> x;
+	auto lock = x.lock();
+
+	lock->x = 5;
+	lock->x++;
+}