| #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 |