From dfebfc835f7b8156a559314bcd1ecff739c14fd1 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Tue, 3 May 2016 14:45:50 +0200
Subject: Add a copyStorePath() utility function

---
 src/libutil/ref.hh | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/libutil/ref.hh')

diff --git a/src/libutil/ref.hh b/src/libutil/ref.hh
index 9f5da0915..85afa2811 100644
--- a/src/libutil/ref.hh
+++ b/src/libutil/ref.hh
@@ -28,6 +28,13 @@ public:
             throw std::invalid_argument("null pointer cast to ref");
     }
 
+    explicit ref<T>(T * p)
+        : p(p)
+    {
+        if (!p)
+            throw std::invalid_argument("null pointer cast to ref");
+    }
+
     T* operator ->() const
     {
         return &*p;
-- 
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