From 1a266c24bf33ff7188d549268d8c5fd055194792 Mon Sep 17 00:00:00 2001
From: Sarah Tappon <sarah.tappon@gmail.com>
Date: Wed, 6 May 2015 22:59:21 -0700
Subject: [PATCH 1/3] add virtual destructor

base classes without virtual destructors risk undefined behavior if their children are deleted through a pointer to base. see https://isocpp.org/wiki/faq/virtual-functions#virtual-dtors
---
 Adafruit_Sensor.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Adafruit_Sensor.h b/Adafruit_Sensor.h
index beb51c8..4e10868 100644
--- a/Adafruit_Sensor.h
+++ b/Adafruit_Sensor.h
@@ -140,6 +140,7 @@ class Adafruit_Sensor {
  public:
   // Constructor(s)
   void constructor();
+  virtual ~Adafruit_Sensor() {}
 
   // These must be defined by the subclass
   virtual void enableAutoRange(bool enabled) {};

From c7b5e92311244679388554aa95f7336567e720c0 Mon Sep 17 00:00:00 2001
From: Sarah Tappon <sarah.tappon@gmail.com>
Date: Wed, 6 May 2015 23:14:39 -0700
Subject: [PATCH 2/3] add default constructor in place of constructor() method

---
 Adafruit_Sensor.cpp | 3 ---
 Adafruit_Sensor.h   | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/Adafruit_Sensor.cpp b/Adafruit_Sensor.cpp
index 2977b27..ee59b27 100644
--- a/Adafruit_Sensor.cpp
+++ b/Adafruit_Sensor.cpp
@@ -1,5 +1,2 @@
 #include "Adafruit_Sensor.h"
 #include <avr/pgmspace.h>
-
-void Adafruit_Sensor::constructor() {
-}
diff --git a/Adafruit_Sensor.h b/Adafruit_Sensor.h
index 4e10868..e6b2c3d 100644
--- a/Adafruit_Sensor.h
+++ b/Adafruit_Sensor.h
@@ -139,7 +139,7 @@ typedef struct
 class Adafruit_Sensor {
  public:
   // Constructor(s)
-  void constructor();
+  Adafruit_Sensor() {}
   virtual ~Adafruit_Sensor() {}
 
   // These must be defined by the subclass

From 73a4e73c87ddda47e82a9d9d2ecf53c1641324db Mon Sep 17 00:00:00 2001
From: Sarah Tappon <sarah.tappon@gmail.com>
Date: Wed, 6 May 2015 23:15:56 -0700
Subject: [PATCH 3/3] mark unimplemented virtual functions as abstract

---
 Adafruit_Sensor.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Adafruit_Sensor.h b/Adafruit_Sensor.h
index e6b2c3d..7742afc 100644
--- a/Adafruit_Sensor.h
+++ b/Adafruit_Sensor.h
@@ -144,8 +144,8 @@ class Adafruit_Sensor {
 
   // These must be defined by the subclass
   virtual void enableAutoRange(bool enabled) {};
-  virtual bool getEvent(sensors_event_t*);
-  virtual void getSensor(sensor_t*);
+  virtual bool getEvent(sensors_event_t*) = 0;
+  virtual void getSensor(sensor_t*) = 0;
   
  private:
   bool _autoRange;