From 2453d20dd01b58cfebc423e1d1f3c0d3addc0def Mon Sep 17 00:00:00 2001
From: David Schulz <david.schulz@qt.io>
Date: Tue, 14 Nov 2017 09:26:38 +0100
Subject: [PATCH] Utils: add filter and transform function for qobject
 container

Add function that casts QObjects of a given container to a desired type
and return the result via the same container with the desired value
type.

Change-Id: I45949c982c8dbdd0cce069d62cd2db5c8517f9f5
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
---
 src/libs/utils/algorithm.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/libs/utils/algorithm.h b/src/libs/utils/algorithm.h
index f24ad579770..3d0b9a6acb4 100644
--- a/src/libs/utils/algorithm.h
+++ b/src/libs/utils/algorithm.h
@@ -32,6 +32,7 @@
 #include <algorithm>
 #include <tuple>
 
+#include <QObject>
 #include <QStringList>
 
 namespace Utils
@@ -371,6 +372,21 @@ C filteredUnique(const C &container)
     return result;
 }
 
+//////////////////
+// qobject_container_cast
+/////////////////
+template <class T, template<typename> class Container, typename Base>
+Container<T> qobject_container_cast(const Container<Base> &container)
+{
+    Container<T> result;
+    auto ins = inserter(result);
+    for (Base val : container) {
+        if (T target = qobject_cast<T>(val))
+            ins = target;
+    }
+    return result;
+}
+
 //////////////////
 // sort
 /////////////////