examples: Remove heap allocation from C++ examples

Cleanup of UPM C++ examples.  Switched from heap allocation to
stack allocation when possible.  This simplifies the samples since it
removes the need for explicit memory management.  A script was used to
identify and replace pointer use.  To simplify the replace script, I
re-formatted the C++ examples using the UPM .clang-format file.
Unfortuantely this changes the look of the UPM C++ examples to a large
degree.  However, examples will now have a standard look/feel and
uniform formatting.

    * Ran clang-format w/provided UPM .clang-format file
    * Removed new's/delete's whenever possible (left those in interface
      examples)
    * Added IIO sensor library implementation of callback void* arg
    * Converted all sleeps to upm defined delays (added header when
      necessary)
    * Scrubbed CXX example includes

Signed-off-by: Noel Eck <noel.eck@intel.com>

examples/c++/enc03r.cxx

@@ -22,10 +22,11 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
 #include <iostream>
 #include <signal.h>
+
 #include "enc03r.hpp"
+#include "upm_utilities.h"
 
 using namespace std;
 
@@ -34,47 +35,43 @@ bool shouldRun = true;
 // analog voltage, usually 3.3 or 5.0
 #define CALIBRATION_SAMPLES 1000
 
-void sig_handler(int signo)
+void
+sig_handler(int signo)
 {
     if (signo == SIGINT)
         shouldRun = false;
 }
 
-int main()
+int
+main()
 {
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a ENC03R on analog pin A0
-    upm::ENC03R *gyro = new upm::ENC03R(0);
+    upm::ENC03R gyro(0);
 
     // The first thing we need to do is calibrate the sensor.
     cout << "Please place the sensor in a stable location, and do not" << endl;
     cout << "move it while calibration takes place." << endl;
     cout << "This may take a couple of minutes." << endl;
 
-    gyro->calibrate(CALIBRATION_SAMPLES);
-    cout << "Calibration complete.  Reference value: "
-         << gyro->calibrationValue() << endl;
+    gyro.calibrate(CALIBRATION_SAMPLES);
+    cout << "Calibration complete.  Reference value: " << gyro.calibrationValue() << endl;
 
     // Read the input and print both the raw value and the angular velocity,
     // waiting 0.1 seconds between readings
-    while (shouldRun)
-    {
-        gyro->update();
+    while (shouldRun) {
+        gyro.update();
 
-        cout << "Angular velocity: "
-             << gyro->angularVelocity()
-             << " deg/s"
-             << endl;
+        cout << "Angular velocity: " << gyro.angularVelocity() << " deg/s" << endl;
 
-        usleep(100000);
+        upm_delay_us(100000);
     }
-//! [Interesting]
+    //! [Interesting]
 
     cout << "Exiting" << endl;
 
-    delete gyro;
     return 0;
 }