Change #if to #ifdef. (#229)

Needed because you can't use preprocessor on undefined variables in
MISRA.

rcl_lifecycle/src/com_interface.c

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#if __cplusplus
+#ifdef __cplusplus
 extern "C"
 {
 #endif
@@ -323,6 +323,6 @@ rcl_lifecycle_com_interface_publish_notification(
   return rcl_publish(&com_interface->pub_transition_event, &msg);
 }
 
-#if __cplusplus
+#ifdef __cplusplus
 }
 #endif

rcl_lifecycle/src/com_interface.h

@@ -15,7 +15,7 @@
 #ifndef COM_INTERFACE_H_
 #define COM_INTERFACE_H_
 
-#if __cplusplus
+#ifdef __cplusplus
 extern "C"
 {
 #endif
@@ -51,7 +51,7 @@ rcl_lifecycle_com_interface_publish_notification(
   rcl_lifecycle_com_interface_t * com_interface,
   const rcl_lifecycle_state_t * start, const rcl_lifecycle_state_t * goal);
 
-#if __cplusplus
+#ifdef __cplusplus
 }
 #endif
 

rcl_lifecycle/src/default_state_machine.c

@@ -27,7 +27,7 @@
 #include "default_state_machine.h"  // NOLINT
 #include "states.h"  // NOLINT
 
-#if __cplusplus
+#ifdef __cplusplus
 extern "C"
 {
 #endif
@@ -476,6 +476,6 @@ fail:
   return RCL_RET_ERROR;
 }
 
-#if __cplusplus
+#ifdef __cplusplus
 }
 #endif  // extern "C"

rcl_lifecycle/src/default_state_machine.h

@@ -21,7 +21,7 @@
 #include "rcl_lifecycle/data_types.h"
 #include "rcl_lifecycle/visibility_control.h"
 
-#if __cplusplus
+#ifdef __cplusplus
 extern "C"
 {
 #endif
@@ -32,7 +32,7 @@ rcl_ret_t
 rcl_lifecycle_init_default_state_machine(
   rcl_lifecycle_state_machine_t * state_machine, const rcl_allocator_t * allocator);
 
-#if __cplusplus
+#ifdef __cplusplus
 }
 #endif
 

rcl_lifecycle/src/rcl_lifecycle.c

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#if __cplusplus
+#ifdef __cplusplus
 extern "C"
 {
 #endif
@@ -360,6 +360,6 @@ rcl_print_state_machine(const rcl_lifecycle_state_machine_t * state_machine)
     }
   }
 }
-#if __cplusplus
+#ifdef __cplusplus
 }
 #endif  // extern "C"

rcl_lifecycle/src/states.h

@@ -18,7 +18,7 @@
 #include "rcl_lifecycle/data_types.h"
 #include "rcl_lifecycle/visibility_control.h"
 
-#if __cplusplus
+#ifdef __cplusplus
 extern "C"
 {
 #endif
@@ -44,7 +44,7 @@ extern const rcl_lifecycle_transition_t rcl_transition_shutdown;
 extern const rcl_lifecycle_transition_t rcl_transition_activate;
 extern const rcl_lifecycle_transition_t rcl_transition_deactivate;
 
-#if __cplusplus
+#ifdef __cplusplus
 }
 #endif  // extern "C"
 

rcl_lifecycle/src/transition_map.c

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#if __cplusplus
+#ifdef __cplusplus
 extern "C"
 {
 #endif
@@ -197,6 +197,6 @@ rcl_lifecycle_get_transitions(
   return NULL;
 }
 
-#if __cplusplus
+#ifdef __cplusplus
 }
 #endif