From e98e10a58e95f3c81e25d9f970f919441e1d3bfc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Sat, 23 Mar 2019 01:02:42 +0100
Subject: [PATCH] Math: make Constants base incomplete.

---
 src/Magnum/Math/Constants.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/Magnum/Math/Constants.h b/src/Magnum/Math/Constants.h
index 7d1cc8594..afb2035c1 100644
--- a/src/Magnum/Math/Constants.h
+++ b/src/Magnum/Math/Constants.h
@@ -40,11 +40,9 @@ namespace Magnum { namespace Math {
 
 @see @ref Magnum::Constants, @ref Magnum::Constantsd
 */
+#ifdef DOXYGEN_GENERATING_OUTPUT
 template<class T> struct Constants {
-    Constants() = delete;
-
     /* See TypeTraits for answer why these are functions and not constants. */
-    #ifdef DOXYGEN_GENERATING_OUTPUT
     /**
      * @brief @f$ \pi @f$.
      *
@@ -141,8 +139,10 @@ template<class T> struct Constants {
      * @see @ref isInf()
      */
     static constexpr T inf();
-    #endif
 };
+#else
+template<class> struct Constants;
+#endif
 
 #ifndef DOXYGEN_GENERATING_OUTPUT
 template<> struct Constants<Double> {