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-rw-r--r--Eigen/src/Core/IO.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/Eigen/src/Core/IO.h b/Eigen/src/Core/IO.h
index 0aa8f22f7..feb2a24a0 100644
--- a/Eigen/src/Core/IO.h
+++ b/Eigen/src/Core/IO.h
@@ -26,6 +26,10 @@
#ifndef EIGEN_IO_H
#define EIGEN_IO_H
+/** \relates MatrixBase
+ *
+ * Outputs the matrix, laid out as an array as usual, to the given stream.
+ */
template<typename Scalar, typename Derived>
std::ostream & operator <<
( std::ostream & s,