From e23c15bb3626515ce915e08b3d14b4dfeaa73a39 Mon Sep 17 00:00:00 2001
From: Howard Hinnant <howard.hinnant@gmail.com>
Date: Wed, 19 May 2021 14:13:33 -0400
Subject: [PATCH] Add string_view overloads to parse functions

---
 include/date/date.h | 61 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/include/date/date.h b/include/date/date.h
index 7b6b4e4..e97175b 100644
--- a/include/date/date.h
+++ b/include/date/date.h
@@ -8070,6 +8070,16 @@ public:
         , offset_(offset)
         {}
 
+#if HAS_STRING_VIEW
+    parse_manip(std::basic_string_view<CharT> format, Parsable& tp,
+                std::basic_string<CharT, Traits, Alloc>* abbrev = nullptr,
+                std::chrono::minutes* offset = nullptr)
+        : format_(format)
+        , tp_(tp)
+        , abbrev_(abbrev)
+        , offset_(offset)
+        {}
+#endif  // HAS_STRING_VIEW
 };
 
 template <class Parsable, class CharT, class Traits, class Alloc>
@@ -8175,6 +8185,57 @@ parse(const CharT* format, Parsable& tp,
     return {format, tp, &abbrev, &offset};
 }
 
+#if HAS_STRING_VIEW
+
+// basic_string_view formats
+
+template <class Parsable, class CharT>
+inline
+auto
+parse(std::basic_string_view<CharT> format, Parsable& tp)
+    -> decltype(from_stream(std::declval<std::basic_istream<CharT>&>(), format.data(), tp),
+                parse_manip<Parsable, CharT>{format, tp})
+{
+    return {format, tp};
+}
+
+template <class Parsable, class CharT, class Traits, class Alloc>
+inline
+auto
+parse(std::basic_string_view<CharT> format,
+      Parsable& tp, std::basic_string<CharT, Traits, Alloc>& abbrev)
+    -> decltype(from_stream(std::declval<std::basic_istream<CharT, Traits>&>(), format.data(),
+                            tp, &abbrev),
+                parse_manip<Parsable, CharT, Traits, Alloc>{format, tp, &abbrev})
+{
+    return {format, tp, &abbrev};
+}
+
+template <class Parsable, class CharT>
+inline
+auto
+parse(std::basic_string_view<CharT> format, Parsable& tp, std::chrono::minutes& offset)
+    -> decltype(from_stream(std::declval<std::basic_istream<CharT>&>(), format.data(),
+                            tp, std::declval<std::basic_string<CharT>*>(), &offset),
+                parse_manip<Parsable, CharT>{format, tp, nullptr, &offset})
+{
+    return {format, tp, nullptr, &offset};
+}
+
+template <class Parsable, class CharT, class Traits, class Alloc>
+inline
+auto
+parse(std::basic_string_view<CharT> format, Parsable& tp,
+      std::basic_string<CharT, Traits, Alloc>& abbrev, std::chrono::minutes& offset)
+    -> decltype(from_stream(std::declval<std::basic_istream<CharT, Traits>&>(), format.data(),
+                            tp, &abbrev, &offset),
+                parse_manip<Parsable, CharT, Traits, Alloc>{format, tp, &abbrev, &offset})
+{
+    return {format, tp, &abbrev, &offset};
+}
+
+#endif  // HAS_STRING_VIEW
+
 // duration streaming
 
 template <class CharT, class Traits, class Rep, class Period>