From ec5315a9870d42a8ba154c3456b36089a6066466 Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Sun, 28 Mar 2021 08:01:55 -0700
Subject: [PATCH] Use strlen when possible in fallback basic_string_view

---
 include/fmt/core.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/fmt/core.h b/include/fmt/core.h
index d54a0784..42e930a9 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -395,8 +395,12 @@ template <typename Char> class basic_string_view {
 #if __cplusplus >= 201703L  // C++17's char_traits::length() is constexpr.
   FMT_CONSTEXPR
 #endif
-  FMT_INLINE basic_string_view(const Char* s)
-      : data_(s), size_(std::char_traits<Char>::length(s)) {}
+  FMT_INLINE basic_string_view(const Char* s) : data_(s) {
+    if (std::is_same<Char, char>::value)
+      size_ = std::strlen(reinterpret_cast<const char*>(s));
+    else
+      size_ = std::char_traits<Char>::length(s);
+  }
 
   /** Constructs a string reference from a ``std::basic_string`` object. */
   template <typename Traits, typename Alloc>