Let folly::range be constexpr

[folly.git] / folly / Range.h

diff --git a/folly/Range.h b/folly/Range.h
index 97a7f1d082ba213f6c2025a855199bb171bdd00d..06123d346611b3f836f259fb96db455be20f612a 100644 (file)
--- a/folly/Range.h
+++ b/folly/Range.h
@@ -864,7 +864,7 @@ void swap(Range<T>& lhs, Range<T>& rhs) {
  * Create a range from two iterators, with type deduction.
  */
 template <class Iter>
-Range<Iter> range(Iter first, Iter last) {
+constexpr Range<Iter> range(Iter first, Iter last) {
   return Range<Iter>(first, last);
 }
 
@@ -872,15 +872,16 @@ Range<Iter> range(Iter first, Iter last) {
  * Creates a range to reference the contents of a contiguous-storage container.
  */
 // Use pointers for types with '.data()' member
-template <class Collection,
-          class T = typename std::remove_pointer<
-              decltype(std::declval<Collection>().data())>::type>
-Range<T*> range(Collection&& v) {
+template <
+    class Collection,
+    class T = typename std::remove_pointer<
+        decltype(std::declval<Collection>().data())>::type>
+constexpr Range<T*> range(Collection&& v) {
   return Range<T*>(v.data(), v.data() + v.size());
 }
 
 template <class T, size_t n>
-Range<T*> range(T (&array)[n]) {
+constexpr Range<T*> range(T (&array)[n]) {
   return Range<T*>(array, array + n);
 }