From 747c6a51ca36f2cb0d519b83a8a03191b283dfb2 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 11 Sep 2019 15:40:07 +0200
Subject: bug #1736: fix compilation issue with A(all,{1,2}).col(j) by
 implementing true compile-time "if" for
 block_evaluator<>::coeff(i)/coeffRef(i)

---
 Eigen/src/Core/util/Meta.h | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'Eigen/src/Core/util/Meta.h')

diff --git a/Eigen/src/Core/util/Meta.h b/Eigen/src/Core/util/Meta.h
index 8fcb18a94..f57739c35 100755
--- a/Eigen/src/Core/util/Meta.h
+++ b/Eigen/src/Core/util/Meta.h
@@ -63,6 +63,15 @@ typedef std::size_t UIntPtr;
 struct true_type {  enum { value = 1 }; };
 struct false_type { enum { value = 0 }; };
 
+template<bool Condition>
+struct bool_constant;
+
+template<>
+struct bool_constant<true> : true_type {};
+
+template<>
+struct bool_constant<false> : false_type {};
+
 template<bool Condition, typename Then, typename Else>
 struct conditional { typedef Then type; };
 
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