From 37d6d2f18a15dc88eefc9eef128be7ef76b69f42 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Mon, 16 Nov 2020 18:43:54 +0100
Subject: [PATCH] Add a sign() function for real numbers.

---
 include/lol/private/types/real.h   | 1 +
 include/lol/private/types/real.ipp | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/lol/private/types/real.h b/include/lol/private/types/real.h
index 7eb6ea59..a9aa6221 100644
--- a/include/lol/private/types/real.h
+++ b/include/lol/private/types/real.h
@@ -157,6 +157,7 @@ public:
     template<typename U> friend real_t<U> fract(real_t<U> const &x);
     template<typename U> friend real_t<U> degrees(real_t<U> const &x);
     template<typename U> friend real_t<U> radians(real_t<U> const &x);
+    template<typename U> friend int sign(real_t<U> const &x);
 
     // Additional functions
     template<typename U> friend real_t<U> franke(real_t<U> const &x,
diff --git a/include/lol/private/types/real.ipp b/include/lol/private/types/real.ipp
index 867068fd..40b2abfa 100644
--- a/include/lol/private/types/real.ipp
+++ b/include/lol/private/types/real.ipp
@@ -1007,6 +1007,11 @@ template<typename T> real_t<T> radians(real_t<T> const &x)
     return x * mul;
 }
 
+template<typename T> int sign(real_t<T> const &x)
+{
+    return x.is_zero() ? 0 : x.is_negative() ? -1 : 1;
+}
+
 template<typename T> real_t<T> fast_log(real_t<T> const &x)
 {
     /* This fast log method is tuned to work on the [1..2] range and