From 0fd8bbf920208b61992757a11b9237cec1c9afe9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mael=20Rouxel-Labb=C3=A9?=
 <mael.rouxel.labbe@geometryfactory.com>
Date: Fri, 26 Jun 2020 16:21:09 +0200
Subject: [PATCH] Re-add doc of operator<<(stream, Class) in io.h

---
 Stream_support/include/CGAL/IO/io.h | 42 +++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/Stream_support/include/CGAL/IO/io.h b/Stream_support/include/CGAL/IO/io.h
index 80de620f4ea..70465314fea 100644
--- a/Stream_support/include/CGAL/IO/io.h
+++ b/Stream_support/include/CGAL/IO/io.h
@@ -82,6 +82,48 @@ enum Mode {ASCII = 0, PRETTY, BINARY};
 
 } // namespace IO
 
+#ifdef DOXYGEN_RUNNING
+/*!
+\ingroup IOstreamOperators
+
+\brief Inserts object `c` in the stream `os`. Returns `os`.
+\cgal defines output operators for classes that are derived
+from the class `ostream`. This allows to write to ostreams
+as `cout` or `cerr`, as well as to `std::ostringstream`
+and `std::ofstream`.
+The output operator is defined for all classes in the \cgal `Kernel` and for the class `Color` as well.
+
+\sa `CGAL::set_mode()`
+\sa `CGAL::set_ascii_mode()`
+\sa `CGAL::set_binary_mode()`
+\sa `CGAL::set_pretty_mode()`
+\sa `CGAL::get_mode()`
+\sa `CGAL::is_ascii()`
+\sa `CGAL::is_binary()`
+\sa `CGAL::is_pretty()`
+*/
+ostream& operator<<(ostream& os, Class c);
+
+/*!
+\ingroup IOstreamOperators
+
+\brief \cgal defines input operators for classes that are derived
+from the class `istream`. This allows to read from istreams
+as `std::cin`, as well as from `std::istringstream` and `std::ifstream`.
+The input operator is defined for all classes in the \cgal `Kernel`.
+
+\sa `CGAL::set_mode()`
+\sa `CGAL::set_ascii_mode()`
+\sa `CGAL::set_binary_mode()`
+\sa `CGAL::set_pretty_mode()`
+\sa `CGAL::get_mode()`
+\sa `CGAL::is_ascii()`
+\sa `CGAL::is_binary()`
+\sa `CGAL::is_pretty()`
+*/
+istream& operator>>(istream& is, Class c);
+#endif
+
 template <typename Dummy>
 struct IO_rep_is_specialized_aux
 {