mirror of https://github.com/procxx/kepka.git
46 lines
912 B
C++
46 lines
912 B
C++
#ifndef MAPBOX_UTIL_VARIANT_IO_HPP
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#define MAPBOX_UTIL_VARIANT_IO_HPP
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#include <iosfwd>
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#include <mapbox/variant.hpp>
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namespace mapbox {
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namespace util {
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namespace detail {
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// operator<< helper
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template <typename Out>
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class printer
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{
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public:
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explicit printer(Out& out)
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: out_(out) {}
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printer& operator=(printer const&) = delete;
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// visitor
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template <typename T>
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void operator()(T const& operand) const
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{
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out_ << operand;
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}
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private:
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Out& out_;
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};
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}
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// operator<<
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template <typename CharT, typename Traits, typename... Types>
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VARIANT_INLINE std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& out, variant<Types...> const& rhs)
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{
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detail::printer<std::basic_ostream<CharT, Traits>> visitor(out);
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apply_visitor(visitor, rhs);
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return out;
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}
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} // namespace util
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} // namespace mapbox
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#endif // MAPBOX_UTIL_VARIANT_IO_HPP
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