X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcollection.h;h=38d93213b770a167ab606f9760dc9d2fe1d50b65;hb=82d55799ee319bf2db357f2d5aded01ad0e2076f;hp=d0e8a1a8bb9b25c636ab23a8c1e4bbdcfa5c04a7;hpb=465ac6c7ceda80ce7e2f6e3f7b6901ce0921406e;p=libs%2Fdatafile.git

diff --git a/source/collection.h b/source/collection.h
index d0e8a1a..38d9321 100644
--- a/source/collection.h
+++ b/source/collection.h
@@ -3,6 +3,7 @@
 
 #include <msp/core/attributes.h>
 #include <msp/core/maputils.h>
+#include <msp/core/noncopyable.h>
 #include <msp/core/refptr.h>
 #include "collectionsource.h"
 #include "loader.h"
@@ -49,7 +50,7 @@ that are not present.  Items retrieted from the fallback collection are shared
 between the collections, and are only deleted when all collections in the chain
 have been destroyed.
 */
-class Collection
+class Collection: private NonCopyable
 {
 public:
 	/**
@@ -91,8 +92,6 @@ private:
 	SourceList sources;
 	Collection *fallback;
 
-	Collection(const Collection &);
-	Collection &operator=(const Collection &);
 public:
 	Collection();
 	virtual ~Collection();
@@ -135,8 +134,27 @@ public:
 		return extract<NCT>(get_var(name, get_type<NCT>(name)));
 	}
 
+	/** Finds a typed object in the collection.  Returns null if the name does
+	not exist.  Throws if the name exists but the object is of an incorrect
+	type. */
+	template<typename T>
+	T *find(const std::string &name) const
+	{
+		ItemMap::const_iterator i = items.find(name);
+		return (i!=items.end() ? extract<typename RemoveConst<T>::Type>(i->second) : 0);
+	}
+
+	template<typename T>
+	T *find(const std::string &name)
+	{
+		typedef typename RemoveConst<T>::Type NCT;
+		const Variant *var = find_var(name, get_type<NCT>(name));
+		return (var ? &extract<NCT>(*var) : 0);
+	}
+
 private:
 	const Variant &get_var(const std::string &, const CollectionItemTypeBase *);
+	const Variant *find_var(const std::string &, const CollectionItemTypeBase *);
 
 	template<typename T>
 	T &extract(const Variant &var) const;