bug #1520: workaround some -Wfloat-equal warnings by calling std::equal_to

1 files changed, 20 insertions, 0 deletions

diff --git a/Eigen/src/Core/util/Meta.h b/Eigen/src/Core/util/Meta.h
index 998b8921a..e7729fdc8 100755
--- a/Eigen/src/Core/util/Meta.h
+++ b/Eigen/src/Core/util/Meta.h
@@ -543,6 +543,26 @@ T div_ceil(const T &a, const T &b)
   return (a+b-1) / b;
 }
 
+// The aim of the following functions is to bypass -Wfloat-equal warnings
+// when we really want a strict equality comparison on floating points.
+template<typename X, typename Y>
+bool equal_strict(const X& x,const Y& y) { return x == y; }
+
+template<>
+bool equal_strict(const float& x,const float& y) { return std::equal_to<float>()(x,y); }
+
+template<>
+bool equal_strict(const double& x,const double& y) { return std::equal_to<double>()(x,y); }
+
+template<typename X, typename Y>
+bool not_equal_strict(const X& x,const Y& y) { return x != y; }
+
+template<>
+bool not_equal_strict(const float& x,const float& y) { return std::not_equal_to<float>()(x,y); }
+
+template<>
+bool not_equal_strict(const double& x,const double& y) { return std::not_equal_to<double>()(x,y); }
+
 } // end namespace numext
 
 } // end namespace Eigen