Merge remote-tracking branch 'origin/development'

# Conflicts:
#	support/Release notes.txt

include/etl/optional.h

@@ -313,6 +313,18 @@ namespace etl
       other = temp;
     }
 
+    //***************************************************************************
+    /// Reset back to invalid.
+    //***************************************************************************
+    void reset()
+    {
+      if (valid)
+      {
+        storage.template get_reference<T>().~T();
+        valid = false;
+      }
+    }
+
   private:
 
     typename etl::aligned_storage_as<sizeof(T), T>::type storage;

support/Release notes.txt

@@ -1,3 +1,7 @@
+===============================================================================
+11.00.1
+Added reset() to etl::optional
+
 ===============================================================================
 11.00.0
 New directory structure.

test/test_optional.cpp

@@ -396,5 +396,15 @@ namespace
       CHECK_EQUAL(data1, original2);
       CHECK_EQUAL(data2, original1);
     }
+
+    //*************************************************************************
+    TEST(test_reset)
+    {
+      etl::optional<Data> data(Data("1"));
+      CHECK(bool(data));
+
+      data.reset();
+      CHECK(!bool(data));
+    }
   };
 }