From 31440829097397a857076fc7785a4ceffc076bac Mon Sep 17 00:00:00 2001
From: "Jordan Maples [MSFT]" <49793787+JordanMaples@users.noreply.github.com>
Date: Mon, 24 Feb 2020 11:16:26 -0800
Subject: [PATCH] forward declare span and remove header

---
 include/gsl/span | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/gsl/span b/include/gsl/span
index 23c58c9..e8ca691 100644
--- a/include/gsl/span
+++ b/include/gsl/span
@@ -21,7 +21,6 @@
 #include <gsl/gsl_byte>   // for byte
 #include <gsl/gsl_util>   // for narrow_cast, narrow
 
-#include <array>     // for array
 #include <cstddef>   // for ptrdiff_t, size_t, nullptr_t
 #include <iterator>  // for reverse_iterator, distance, random_access_...
 #include <type_traits> // for enable_if_t, declval, is_convertible, inte...
@@ -63,6 +62,15 @@
 #pragma GCC diagnostic ignored "-Wsign-conversion"
 #endif
 
+namespace std
+{
+// forward declaring std::array.
+// array is only used for a few constructors, so pulling the entire header is unnecessary for span.
+// The end user's logic will pull in the actual definition of array if they need it.
+template <class Type, std::size_t Sz>
+class array;
+}
+
 namespace gsl
 {