Fix unarchiving empty containers.

[ginac.git] / ginac / container.h

diff --git a/ginac/container.h b/ginac/container.h
index 960f07297541f481d9968f74788b3c1f20a13550..4360bcc01ae353b6d3f790e792b33027c35db15f 100644 (file)
--- a/ginac/container.h
+++ b/ginac/container.h
@@ -212,14 +212,12 @@ public:
                inherited::read_archive(n, sym_lst);
                setflag(get_default_flags());
 
-               archive_node::archive_node_cit first = n.find_first("seq");
-               archive_node::archive_node_cit last = n.find_last("seq");
-               ++last;
-               this->reserve(this->seq, last - first);
-               for (archive_node::archive_node_cit i=first; i<last; ++i) {
+               auto range =  n.find_property_range("seq", "seq");
+               this->reserve(this->seq, range.end - range.begin);
+               for (archive_node::archive_node_cit i=range.begin; i<range.end; ++i) {
                        ex e;
                        n.find_ex_by_loc(i, e, sym_lst);
-                       this->seq.push_back(e);
+                       this->seq.emplace_back(e);
                }
        }