1 files changed, 25 insertions, 0 deletions
diff --git a/utils/batched_append.h b/utils/batched_append.h
new file mode 100755
index 00000000..14a6d576
--- /dev/null
+++ b/utils/batched_append.h
@@ -0,0 +1,25 @@
+#ifndef BATCHED_APPEND_H
+#define BATCHED_APPEND_H
+
+#include <algorithm> //swap
+#include <cstddef>
+
+template <class SRange,class Vector>
+void batched_append(Vector &v,SRange const& s) {
+  std::size_t news=v.size()+s.size();
+  v.reserve(news);
+  v.insert(v.end(),s.begin(),s.end());
+}
+
+template <class SRange,class Vector>
+void batched_append_swap(Vector &v,SRange & s) {
+  using namespace std; // to find the right swap
+  size_t i=v.size();
+  size_t news=i+s.size();
+  v.resize(news);
+  typename SRange::iterator si=s.begin();
+  for (;i<news;++i,++si)
+    swap(v[i],*si);
+}
+
+#endif