Class const_json

cpp/icm/const_json.hpp:29–578

namespace icm {

class const_json
{
private:
    using rapid_const_iter = rapidjson::Value::ConstMemberIterator;
    using rapid_array_const_iterator = rapidjson::Value::ConstValueIterator;

    struct processor
    {
        std::shared_ptr<rapidjson::Document> doc_;
        explicit processor(std::shared_ptr<rapidjson::Document> doc) 
            : doc_(std::move(doc))
        {
        }

        std::pair<std::string_view, const_json> operator()(const rapid_const_iter::value_type& value) const
        {
            return {
                std::string_view(value.name.GetString(), value.name.GetStringLength()),
                const_json(value.value, doc_)
            };
        }

        const_json operator()(const rapidjson::Value& value) const
        {
            return const_json(value, doc_);
        }
    };

    auto make_iterator(const rapid_const_iter& it) const
    {
        return boost::make_transform_iterator(it, processor(doc_));
    }

    auto make_iterator(const rapid_array_const_iterator& it) const
    {
        return boost::make_transform_iterator(it, processor(doc_));
    }

public:
    using const_iterator = boost::transform_iterator<
        processor,
        rapid_const_iter,
        std::pair<std::string_view, const_json>
    >;

    using array_const_iterator = boost::transform_iterator<
        processor,
        rapid_array_const_iterator,
        const_json
    >;

    /// @name Constructors
    /// @{
public:
    const_json()
        : doc_(std::make_shared<rapidjson::Document>())
        , val_(&*doc_)
    {