1 files changed, 12 insertions, 0 deletions
diff --git a/third_party/base/stl_util.h b/third_party/base/stl_util.h
index ab3ac60911..8163b73951 100644
--- a/third_party/base/stl_util.h
+++ b/third_party/base/stl_util.h
@@ -16,6 +16,18 @@
 
 namespace pdfium {
 
+// C++11 implementation of C++17's std::size():
+// http://en.cppreference.com/w/cpp/iterator/size
+template <typename Container>
+constexpr auto size(const Container& c) -> decltype(c.size()) {
+  return c.size();
+}
+
+template <typename T, size_t N>
+constexpr size_t size(const T (&array)[N]) noexcept {
+  return N;
+}
+
 // Test to see if a set, map, hash_set or hash_map contains a particular key.
 // Returns true if the key is in the collection.
 template <typename Collection, typename Key>