From 9a56a608ee6f357825c65789bd4f28e73070d70a Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Sat, 31 Aug 2019 07:10:33 -0700
Subject: [PATCH] Fix warnings (#1288)

---
 include/fmt/safe-duration-cast.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/include/fmt/safe-duration-cast.h b/include/fmt/safe-duration-cast.h
index aa036182..57a96bc6 100644
--- a/include/fmt/safe-duration-cast.h
+++ b/include/fmt/safe-duration-cast.h
@@ -62,7 +62,7 @@ FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) {
 
   if (F::is_signed && !T::is_signed) {
     // From may be negative, not allowed!
-    if (from < 0) {
+    if (fmt::internal::is_negative(from)) {
       ec = 1;
       return {};
     }
@@ -182,14 +182,12 @@ To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from,
   }
   // multiply with Factor::num without overflow or underflow
   if (Factor::num != 1) {
-    constexpr auto max1 =
-        std::numeric_limits<IntermediateRep>::max() / Factor::num;
+    const auto max1 = std::numeric_limits<IntermediateRep>::max() / Factor::num;
     if (count > max1) {
       ec = 1;
       return {};
     }
-    constexpr auto min1 =
-        std::numeric_limits<IntermediateRep>::min() / Factor::num;
+    const auto min1 = std::numeric_limits<IntermediateRep>::min() / Factor::num;
     if (count < min1) {
       ec = 1;
       return {};