[PATCH] D33651: [ADT] Add convenience functions for making forward and reverse ranges with an STL container.

[Frederich Munch via Phabricator via llvm-commits]

marsupial created this revision.

https://reviews.llvm.org/D33651

Files:
  include/llvm/ADT/iterator_range.h


Index: include/llvm/ADT/iterator_range.h
===================================================================
--- include/llvm/ADT/iterator_range.h
+++ include/llvm/ADT/iterator_range.h
@@ -63,6 +63,29 @@
 iterator_range<decltype(begin(std::declval<T>()))> drop_begin(T &&t, int n) {
   return make_range(std::next(begin(t), n), end(t));
 }
+
+/// \brief Convenience function for iterating over stl-like containers.
+///
+/// This provides a bit of syntactic sugar to make using ranges in loops a bit
+/// easier.
+template <typename T> iterator_range<typename T::iterator> make_range(T &C) {
+  return iterator_range<typename T::iterator>(C.begin(), C.end());
+}
+
+template <typename T>
+iterator_range<typename T::reverse_iterator> reverse_range(T &C) {
+  return iterator_range<typename T::reverse_iterator>(C.rbegin(), C.rend());
+}
+
+template <typename T>
+iterator_range<typename T::const_iterator> make_range(const T &C) {
+  return iterator_range<typename T::iterator>(C.begin(), C.end());
+}
+
+template <typename T>
+iterator_range<typename T::const_reverse_iterator> reverse_range(const T &C) {
+  return iterator_range<typename T::reverse_iterator>(C.rbegin(), C.rend());
+}
 }
 
 #endif


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