Add Collection

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

diff --git a/source/loader.h b/source/loader.h
index e1522de11aaa8be8dbcba9d40f74c669cbf373d6..da1da3a23f462f4ed4ec77efd4b8e4c7977336e2 100644 (file)
--- a/source/loader.h
+++ b/source/loader.h
@@ -10,7 +10,7 @@ Distributed under the LGPL
 
 #include <fstream>
 #include <map>
-#include "error.h"
+#include "except.h"
 #include "parser.h"
 #include "statement.h"
 #include "value.h"
@@ -168,6 +168,24 @@ private:
 };
 
 
+template<typename L, typename T0>
+class LoadValue1<L, T0 *>: public LoaderAction
+{
+public:
+       typedef T0 *L::*Pointer0Type;
+
+       LoadValue1(Pointer0Type p0): ptr0(p0) { }
+       void execute(Loader &l, const Statement &st) const
+       {
+               if(st.args.size()!=1) throw TypeError(st.get_location()+": Wrong number of arguments");
+               typename L::Loader &ldr=dynamic_cast<typename L::Loader &>(l);
+               ldr.get_object().*ptr0=&ldr.get_collection().template get<T0>(st.args[0].get<std::string>());
+       }
+private:
+       Pointer0Type ptr0;
+};
+
+
 template<typename L, typename T0, typename T1>
 class LoadValue2: public LoaderAction
 {
@@ -193,7 +211,9 @@ Base class for data loaders.  To give loading capabilities to a class, create a
 public Loader class in it, derived from this class.  Typically a loader object
 contains a reference to the loaded object.  To make use of loading directly
 into data members, the Loader class must have a get_object() member function,
-returning that reference.
+returning that reference.  If direct loading of pointers is desired, the Loader
+class must also have a get_collection() member function, returning a collection
+to get pointers from.
 */
 class Loader
 {