Move NeedsCollection into its own header and adjust for new Sfinae struct

[libs/datafile.git] / source / collection.h

diff --git a/source/collection.h b/source/collection.h
index 89e801ffa87850ebcba5b5452c03a4a15a4dbf0b..34b1260c4c42b729311964736b2efc02343c03fb 100644 (file)
--- a/source/collection.h
+++ b/source/collection.h
@@ -2,10 +2,10 @@
 #define MSP_DATAFILE_COLLECTION_H_
 
 #include <msp/core/maputils.h>
-#include <msp/core/meta.h>
 #include <msp/core/refptr.h>
 #include "collectionsource.h"
 #include "loader.h"
+#include "meta.h"
 
 /* XXX This file is a big mess with too many things in it.  However, the
 dependencies between those things make it difficult to split up. */
@@ -13,20 +13,6 @@ dependencies between those things make it difficult to split up. */
 namespace Msp {
 namespace DataFile {
 
-/**
-Helper struct to determine whether a Loader has a Collection typedef.
-*/
-template<typename T>
-struct NeedsCollection: public Sfinae
-{
-       template<typename U>
-       static Yes f(typename U::Collection *);
-       template<typename U>
-       static No f(...);
-
-       enum { value = Evaluate<sizeof(f<T>(0))>::value };
-};
-
 class CollectionItemTypeBase;
 
 template<typename T>