From 3869392f0a96017d0b586efe433fa20732a78ebf Mon Sep 17 00:00:00 2001
From: Christopher Lackner <christopher.lackner@tuwien.ac.at>
Date: Wed, 21 Aug 2019 11:03:27 +0200
Subject: [PATCH] workaround for windows in index_type typetrait

---
 libsrc/core/utils.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libsrc/core/utils.hpp b/libsrc/core/utils.hpp
index 7f38c948..e18a09f7 100644
--- a/libsrc/core/utils.hpp
+++ b/libsrc/core/utils.hpp
@@ -134,6 +134,9 @@ namespace ngcore
     private:
       template<typename T2>
       static constexpr auto check(T2* t) -> typename T2::index_type { return *t; }
+      // this function is needed for visual because it seems to not lazy evaluate template arguments...
+      template<typename T2>
+      static constexpr auto check(T2* t) -> typename enable_if_t<std::is_integral_t<T>> {} 
       static constexpr auto check(...) -> decltype(std::declval<T>().Size())
       { return decltype(std::declval<T>().Size())(); }
     public: