serialize_boost_variant.hpp

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#pragma once
 
/// @file userver/formats/json/serialize_boost_variant.hpp
/// @brief Serializers for boost::variant types.
/// @ingroup userver_universal userver_formats_serialize
 
#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/variant.hpp>
 
#include <userver/formats/json/value_builder.hpp>
#include <userver/formats/serialize/to.hpp>
 
USERVER_NAMESPACE_BEGIN
 
/// @brief Generic serialization helpers (`formats::serialize::To` and friends).
namespace formats::serialize {
 
template <typename... Types>
formats::json::Value Serialize(const boost::variant<Types...>& value, To<formats::json::Value>) {
    return boost::apply_visitor(
        [](const auto& item) { return formats::json::ValueBuilder(item).ExtractValue(); },
        value
    );
}
 
}  // namespace formats::serialize
 
USERVER_NAMESPACE_END