examples, tutorial: fixed mtapi_cpp

doc/examples/mtapi/mtapi_cpp-fragmented.cc

@@ -45,7 +45,7 @@ static
 #include "mtapi/mtapi_c_calc_direct-snippet.h"
     /* wait for completion */
 #include "mtapi/mtapi_cpp_wait_task-snippet.h"
-    /* add the two preceeding numbers */
+    /* add the two preceding numbers */
 #include "mtapi/mtapi_write_back-snippet.h"
 
 static
@@ -63,6 +63,5 @@ int fibonacci(int n) {
 }
 
 void RunMTAPI_CPP() {
-  int result = fibonacci(6);
-  std::cout << "result: " << result << std::endl;
+#include "mtapi/mtapi_cpp_main-snippet.h"
 }

doc/examples/mtapi/mtapi_cpp_main-snippet.h

+  EMBB_TRY {
+    int result = fibonacci(6);
+    std::cout << "result: " << result << std::endl;
+  } EMBB_CATCH(embb::mtapi::StatusException &) {
+    std::cout << "MTAPI error occured." << std::endl;
+  }

doc/examples/mtapi/mtapi_cpp_wait_task-snippet.h

     mtapi_status_t status = task.Wait(MTAPI_INFINITE);
-    MTAPI_CHECK_STATUS(status);
+    if (status != MTAPI_SUCCESS) {
+      printf("task failed with error: %d\n\n", status);
+      exit(status);
+    }

doc/tutorial/content/mtapi.tex

@@ -156,7 +156,7 @@ After everything is done, the action is deleted (\lstinline|mtapi_action_delete(
 %
 \\\inputlisting{../examples/mtapi/mtapi_c_action_signature-snippet.h}
 %
-Checking the arguments and the result buffer is not done this time for simplicity. However, the terminating condition of the recursion still needs to be checked:
+Checking argument and result buffer sizes is the same as in the C example. Also, the terminating condition of the recursion still needs to be checked:
 %
 \\\inputlisting{../examples/mtapi/mtapi_terminating_condition-snippet.h}
 %
@@ -176,6 +176,10 @@ Finally, the two parts can be added and written into the result buffer:
 %
 \\\inputlisting{../examples/mtapi/mtapi_write_back-snippet.h}
 % 
+Note that there is no need to do error checking everywhere, since errors are reported as exceptions. In this example there is only a single try/catch block in the main function:
+%
+\\\inputlisting{../examples/mtapi/mtapi_cpp_main-snippet.h}
+%
 
 The \lstinline|fibonacci()| function is about the same as in the C version. The MTAPI runtime needs to be initialized first:
 %