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++/mma7361.cxx

@@ -22,73 +22,61 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <unistd.h>
-#include <signal.h>
 #include <iostream>
+#include <signal.h>
+#include <stdio.h>
 
 #include "mma7361.hpp"
+#include "upm_utilities.h"
 
 using namespace std;
 
 bool shouldRun = true;
 
-void sig_handler(int signo)
+void
+sig_handler(int signo)
 {
-  if (signo == SIGINT)
-    shouldRun = false;
+    if (signo == SIGINT)
+        shouldRun = false;
 }
 
-int main()
+int
+main()
 {
-  signal(SIGINT, sig_handler);
+    signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
-  // Instantiate a MMA7361 sensor on analog pins A0 (X), A1 (Y) A2
-  // (Z), selftest pin on D2, sleep pin on D3 nd an analog reference
-  // value of 5.0.  The freefall pin and the range pin are unused
-  // (-1).
-  upm::MMA7361 *sensor = new upm::MMA7361(0, 1, 2, 2, 3, -1, -1, 5.0);
+    // Instantiate a MMA7361 sensor on analog pins A0 (X), A1 (Y) A2
+    // (Z), selftest pin on D2, upm_delay pin on D3 nd an analog reference
+    // value of 5.0.  The freefall pin and the range pin are unused
+    // (-1).
+    upm::MMA7361 sensor(0, 1, 2, 2, 3, -1, -1, 5.0);
 
-  // 1.5g (true = 6g)
-  sensor->setRange(false);
+    // 1.5g (true = 6g)
+    sensor.setRange(false);
 
-  // Every 10th of a second, update and print values
+    // Every 10th of a second, update and print values
 
-  while (shouldRun)
-    {
-      sensor->update();
+    while (shouldRun) {
+        sensor.update();
 
-      float x, y, z;
+        float x, y, z;
 
-      sensor->getAcceleration(&x, &y, &z);
-      cout << "Acceleration x = "
-           << x
-           << " y = "
-           << y
-           << "z = "
-           << z
-           << endl;
+        sensor.getAcceleration(&x, &y, &z);
+        cout << "Acceleration x = " << x << " y = " << y << "z = " << z << endl;
 
-      sensor->getVolts(&x, &y, &z);
-      cout << "Volts x = "
-           << x
-           << " y = "
-           << y
-           << "z = "
-           << z
-           << endl;
+        sensor.getVolts(&x, &y, &z);
+        cout << "Volts x = " << x << " y = " << y << "z = " << z << endl;
 
-      cout << endl;
+        cout << endl;
 
-      usleep(100000);
+        upm_delay_us(100000);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
-  printf("Exiting...\n");
+    printf("Exiting...\n");
 
-  delete sensor;
-
-  return 0;
+    return 0;
 }