From f7e19b5232c588f08c2b48a3a56f42494dd195d9 Mon Sep 17 00:00:00 2001
From: Marc Emmers <m.emmers@syrinx.nl>
Date: Sat, 16 Jan 2021 21:04:05 +0100
Subject: [PATCH] Add deduction guides

---
 platform/cxxsupport/mstd_span | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/platform/cxxsupport/mstd_span b/platform/cxxsupport/mstd_span
index 0a1c7afe68..ccf545f43f 100644
--- a/platform/cxxsupport/mstd_span
+++ b/platform/cxxsupport/mstd_span
@@ -323,6 +323,24 @@ private:
     detail::storage<element_type, extent> _storage;
 };
 
+#if __cplusplus >= 201703L || __cpp_deduction_guides >= 201703L
+// Deduction guides
+template<class It, class EndOrSize>
+span(It, EndOrSize) -> span<remove_reference_t<iter_reference_t<It>>>;
+
+template<class T, size_t N>
+span(T (&)[N]) -> span<T, N>;
+
+template<class T, size_t N>
+span(std::array<T, N>&) -> span<T, N>;
+
+template<class T, size_t N>
+span(const std::array<T, N>&) -> span<const T, N>;
+
+template<class R>
+span(R&&) -> span<remove_reference_t<detail::range_reference_t<R>>>;
+#endif
+
 template<class ElementType, size_t Extent>
 constexpr span<ElementType, Extent> make_span(ElementType (&arr)[Extent])
 {