Upgrade Microsoft-GSL to b74b286d5e333561b0f1ef1abd18de2606624455 am: 98f310ea44

am: 1db4f387ed

Change-Id: I5f43ac982ceb6d062ef0f0589acb84311a9f92e7

2 files changed, 6 insertions, 3 deletions

diff --git a/METADATA b/METADATA
index c1ce0f4..494ca07 100644
--- a/METADATA
+++ b/METADATA
@@ -5,10 +5,10 @@ third_party {
     type: GIT
     value: "https://github.com/Microsoft/GSL"
   }
-  version: "7d78b743e43ecba06ca47426d03d9d16076dec16"
+  version: "b74b286d5e333561b0f1ef1abd18de2606624455"
   last_upgrade_date {
     year: 2019
-    month: 2
-    day: 1
+    month: 5
+    day: 2
   }
 }
diff --git a/include/gsl/string_span b/include/gsl/string_span
index b5dfd18..85112e5 100644
--- a/include/gsl/string_span
+++ b/include/gsl/string_span
@@ -175,6 +175,7 @@ class basic_string_span
 {
 public:
     using element_type = CharT;
+    using value_type = std::remove_cv_t<element_type>;
     using pointer = std::add_pointer_t<element_type>;
     using reference = std::add_lvalue_reference_t<element_type>;
     using const_reference = std::add_lvalue_reference_t<std::add_const_t<element_type>>;
@@ -186,6 +187,8 @@ public:
     using reverse_iterator = typename impl_type::reverse_iterator;
     using const_reverse_iterator = typename impl_type::const_reverse_iterator;
 
+    using size_type = index_type;
+
     // default (empty)
     constexpr basic_string_span() noexcept = default;