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40 lines
1 KiB
C++
40 lines
1 KiB
C++
#ifndef SPROUT_VARIANT_IO_HPP
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#define SPROUT_VARIANT_IO_HPP
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#include <sprout/config.hpp>
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#include <sprout/variant/variant.hpp>
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#include <sprout/variant/static_visitor.hpp>
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namespace sprout {
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namespace detail {
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template<typename OStream>
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class variant_output_visitor
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: public sprout::static_visitor<>
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{
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public:
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typedef OStream ostream_type;
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private:
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ostream_type& out_;
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public:
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explicit variant_output_visitor(ostream_type& out)
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: out_(out)
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{}
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template<typename T>
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void operator()(T const& operand) const {
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out_ << operand;
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}
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};
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} // namespace detail
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//
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// operator<<
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//
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template<typename Elem, typename Traits, typename... Types>
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inline std::basic_ostream<Elem, Traits>&
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operator<<(std::basic_ostream<Elem, Traits>& lhs, sprout::variant<Types...> const& rhs) {
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sprout::detail::variant_output_visitor<std::basic_ostream<Elem, Traits> > visitor(lhs);
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rhs.apply_visitor(visitor);
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return lhs;
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_VARIANT_IO_HPP
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