types: Add STL-compliant Hash functor for Qt types

In order to use Qt types with std::unordered_set (and map), a
compatible hash function needs to be provided. Provide a generic
Hash<T> functor that just uses the qHash() function for the given
type.

This can be used as follows:
    std::unordered_set<QString, Hash<QString>> set;

diff --git a/src/common/types.h b/src/common/types.h
index a806c58..0816223 100644 (file)
--- a/src/common/types.h
+++ b/src/common/types.h
@@ -225,6 +225,16 @@ QDataStream& operator>>(QDataStream& in, T& value)
     return in;
 }
 
     return in;
 }
 

+// STL-compliant hash functor for Qt types
+template<typename T>
+struct Hash
+{
+    uint operator()(const T& t) const
+    {
+        return qHash(t);
+    }
+};
+

 // Exceptions
 
 /**
 // Exceptions
 
 /**