Add operator<< for boost::none

2014-11-24 15:38:24 +01:00
parent 53e53171c4
commit 1d3446304b
2 changed files with 19 additions and 0 deletions
--- a/include/boost/optional/optional_io.hpp
+++ b/include/boost/optional/optional_io.hpp
@ -23,6 +23,15 @@
 namespace boost
 {

+template<class CharType, class CharTrait>
+inline
+std::basic_ostream<CharType, CharTrait>&
+operator<<(std::basic_ostream<CharType, CharTrait>& out, none_t const&)
+{
+    out << "--";
+    return out;
+}
+
 template<class CharType, class CharTrait, class T>
 inline
 std::basic_ostream<CharType, CharTrait>&