Fix unarchiving empty containers.

[ginac.git] / ginac / archive.h

diff --git a/ginac/archive.h b/ginac/archive.h
index 53c45437e4e5e439c92d7de92932e418c402af98..c3314f13a6028a8948e974619c2dbeec0d9936cb 100644 (file)
--- a/ginac/archive.h
+++ b/ginac/archive.h
@@ -82,6 +82,9 @@ public:
                unsigned value;     /**< Stored value. */
        };
        typedef std::vector<property>::const_iterator archive_node_cit;
+       struct archive_node_cit_range {
+               archive_node_cit begin, end;
+       };
 
        archive_node(archive &ar) : a(ar), has_expression(false) {}
        archive_node(archive &ar, const ex &expr);
@@ -113,17 +116,22 @@ public:
        bool find_string(const std::string &name, std::string &ret, unsigned index = 0) const;
 
        /** Find the location in the vector of properties of the first/last
-    *  property with a given name. */
+        *  property with a given name. */
        archive_node_cit find_first(const std::string &name) const;
        archive_node_cit find_last(const std::string &name) const;
 
+       /** Find a range of locations in the vector of properties. The result
+        *  begins at the first property with name1 and ends one past the last
+        *  property with name2. */
+       archive_node_cit_range find_property_range(const std::string &name1, const std::string &name2) const;
+
        /** Retrieve property of type "ex" from node.
         *  @return "true" if property was found, "false" otherwise */
        bool find_ex(const std::string &name, ex &ret, lst &sym_lst, unsigned index = 0) const;
 
        /** Retrieve property of type "ex" from the node if it is known
-    *  that this node in fact contains such a property at the given
-    *  location. This is much more efficient than the preceding function. */
+        *  that this node in fact contains such a property at the given
+        *  location. This is much more efficient than the preceding function. */
        void find_ex_by_loc(archive_node_cit loc, ex &ret, lst &sym_lst) const;
 
        /** Retrieve property of type "ex" from node, returning the node of
@@ -271,14 +279,14 @@ public:
        /** Retrieve expression from archive by index.
         *  @param sym_lst list of pre-defined symbols
         *  @param index index of expression
-     *  @see count_expressions */
+        *  @see count_expressions */
        ex unarchive_ex(const lst &sym_lst, unsigned index = 0) const;
 
        /** Retrieve expression and its name from archive by index.
         *  @param sym_lst list of pre-defined symbols
         *  @param name receives the name of the expression
         *  @param index index of expression
-     *  @see count_expressions */
+        *  @see count_expressions */
        ex unarchive_ex(const lst &sym_lst, std::string &name, unsigned index = 0) const;
 
        /** Return number of archived expressions. */