Add qvi_delete(). (#87)

Signed-off-by: Samuel K. Gutierrez <samuel@lanl.gov>

src/qvi-hwpool.cc

@@ -239,12 +239,7 @@ void
 qvi_hwpool_free(
     qvi_hwpool_t **rpool
 ) {
-    if (!rpool) return;
-    qvi_hwpool_t *irpool = *rpool;
-    if (!irpool) goto out;
-    delete irpool;
-out:
-    *rpool = nullptr;
+    qvi_delete(rpool);
 }
 
 int

src/qvi-utils.h

@@ -21,6 +21,22 @@
 
 #ifdef __cplusplus
 
+/**
+ * Simple wrapper around delete that also nullifies the input pointer.
+ */
+template <class T>
+void
+qvi_delete(
+    T **t
+) {
+    if (!t) return;
+    T *it = *t;
+    if (!it) goto out;
+    delete it;
+out:
+    *t = nullptr;
+}
+
 /**
  * Returns the code captured by a constructor. Since we are trying to avoid the
  * use of exceptions, we instead use this method for checking the state of an