From 9ffd294f072c55e8afa04fc78e44354abf262544 Mon Sep 17 00:00:00 2001
From: Enrico Turri <enricoturri@seznam.cz>
Date: Mon, 17 Jun 2019 09:28:41 +0200
Subject: [PATCH] Fixed functions declaration template<class Tf> inline
 constexpr coord_t scaled(Tf val) and template<class Tf> inline constexpr Tf
 unscaled(coord_t val) to use constexpr on versions of Visual Studio which
 support it

---
 src/libslic3r/libslic3r.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/libslic3r/libslic3r.h b/src/libslic3r/libslic3r.h
index e1d247894..c95c95c1a 100644
--- a/src/libslic3r/libslic3r.h
+++ b/src/libslic3r/libslic3r.h
@@ -49,13 +49,21 @@ typedef double  coordf_t;
 //inline coord_t scale_(coordf_t v) { return coord_t(floor(v / SCALING_FACTOR + 0.5f)); }
 #define scale_(val) ((val) / SCALING_FACTOR)
 
+#if defined(_MSC_VER) && (_MSC_VER < 1910)
+template<class Tf> inline coord_t scaled(Tf val)
+#else
 template<class Tf> inline constexpr coord_t scaled(Tf val)
+#endif // _MSC_VER
 {
     static_assert (std::is_floating_point<Tf>::value, "Floating point only");
     return coord_t(val / Tf(SCALING_FACTOR));
 }
 
+#if defined(_MSC_VER) && (_MSC_VER < 1910)
+template<class Tf> inline Tf unscaled(coord_t val)
+#else
 template<class Tf> inline constexpr Tf unscaled(coord_t val)
+#endif // _MSC_VER
 {
     static_assert (std::is_floating_point<Tf>::value, "Floating point only");
     return Tf(val * Tf(SCALING_FACTOR));