From fa894d7cbc7e27a64fa7e466fa56e718079da24c Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Thu, 21 Jan 2016 13:03:03 -0800
Subject: [core] Polyfill std::chrono::abs

---
 include/mbgl/util/chrono.hpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'include/mbgl/util/chrono.hpp')

diff --git a/include/mbgl/util/chrono.hpp b/include/mbgl/util/chrono.hpp
index dd228df977..219b827536 100644
--- a/include/mbgl/util/chrono.hpp
+++ b/include/mbgl/util/chrono.hpp
@@ -53,6 +53,14 @@ std::string iso8601(SystemTimePoint);
 
 SystemTimePoint parseTimePoint(const char *);
 
+// C++17 polyfill
+template <class Rep, class Period, class = std::enable_if_t<
+   std::chrono::duration<Rep, Period>::min() < std::chrono::duration<Rep, Period>::zero()>>
+constexpr std::chrono::duration<Rep, Period> abs(std::chrono::duration<Rep, Period> d)
+{
+    return d >= d.zero() ? d : -d;
+}
+
 } // namespace util
 
 } // namespace mbgl
-- 
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