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authorwanglu <wang_lu@dl.cn.nexty-ele.com>2019-03-25 09:42:49 +0800
committerwanglu <wang_lu@dl.cn.nexty-ele.com>2019-03-25 09:52:02 +0800
commit4a8b7a6301e4b093c99329d0a16fbee6c535f312 (patch)
treefe9f589e1723e8f173b50dfa617374042f4cf7a7 /include/mapbox/variant_io.hpp
parentfb539bbd9f7b36d26cd56fe09b804e18b3b3d984 (diff)
Change-Id: I0866a7d9ffa347c0935b4d00259ad1a74cd00d6e Signed-off-by: wanglu <wang_lu@dl.cn.nexty-ele.com>
Diffstat (limited to 'include/mapbox/variant_io.hpp')
-rw-r--r--include/mapbox/variant_io.hpp45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/mapbox/variant_io.hpp b/include/mapbox/variant_io.hpp
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+#ifndef MAPBOX_UTIL_VARIANT_IO_HPP
+#define MAPBOX_UTIL_VARIANT_IO_HPP
+
+#include <iosfwd>
+
+#include <mapbox/variant.hpp>
+
+namespace mapbox {
+namespace util {
+
+namespace detail {
+// operator<< helper
+template <typename Out>
+class printer
+{
+public:
+ explicit printer(Out& out)
+ : out_(out) {}
+ printer& operator=(printer const&) = delete;
+
+ // visitor
+ template <typename T>
+ void operator()(T const& operand) const
+ {
+ out_ << operand;
+ }
+
+private:
+ Out& out_;
+};
+}
+
+// operator<<
+template <typename CharT, typename Traits, typename... Types>
+VARIANT_INLINE std::basic_ostream<CharT, Traits>&
+operator<<(std::basic_ostream<CharT, Traits>& out, variant<Types...> const& rhs)
+{
+ detail::printer<std::basic_ostream<CharT, Traits>> visitor(out);
+ apply_visitor(visitor, rhs);
+ return out;
+}
+} // namespace util
+} // namespace mapbox
+
+#endif // MAPBOX_UTIL_VARIANT_IO_HPP