From 2cfc025bdaf36f3e4693a48db48ba2366b281cfc Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Tue, 19 Feb 2019 14:05:22 +0100
Subject: [PATCH] fix unit compilation in c++17: std::ptr_fun has been removed.

---
 test/indexed_view.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/test/indexed_view.cpp b/test/indexed_view.cpp
index 6d6ef0cd4..5f1e01fc8 100644
--- a/test/indexed_view.cpp
+++ b/test/indexed_view.cpp
@@ -95,7 +95,11 @@ void check_indexed_view()
   ArrayXd a = ArrayXd::LinSpaced(n,0,n-1);
   Array<double,1,Dynamic> b = a.transpose();
 
-  ArrayXXi A = ArrayXXi::NullaryExpr(n,n, std::ptr_fun(encode));
+  #if EIGEN_COMP_CXXVER>=14
+  ArrayXXi A = ArrayXXi::NullaryExpr(n,n, std::ref(encode));
+  #else
+  ArrayXXi A = ArrayXXi::NullaryExpr(n,n, std::ptr_fun(&encode));
+  #endif
 
   for(Index i=0; i<n; ++i)
     for(Index j=0; j<n; ++j)