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162e13b86f
* Add helper types to make it easier to create a basic_json type with modified template parameters Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Rename with_changed_*_t aliases to with_*_t and merge integer/unsigned aliases Per review discussion on #3898 between gregmarr and nlohmann: - rename with_changed_X_t to with_X_t for brevity - replace the separate with_changed_integer_t/with_changed_unsigned_t aliases with a single with_integers_t<NumberIntegerType2, NumberUnsignedType2> - add @sa doc comment links for the upcoming documentation page Co-authored-by: Raphael Grimm <1005058+barcode@users.noreply.github.com> Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Add documentation for the with_*_t member alias templates Add docs/mkdocs/docs/api/basic_json/with_t.md documenting with_object_t, with_array_t, with_string_t, with_boolean_t, with_integers_t, with_float_t, with_allocator_t, with_json_serializer_t, with_binary_t and with_base_class_t, with an accompanying example, and link the page from the basic_json member types list and the mkdocs navigation. Co-authored-by: Raphael Grimm <1005058+barcode@users.noreply.github.com> Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Add tests for the with_*_t member alias templates Check with std::is_same that each with_*_t alias produces the expected basic_json type, and that with_string_t keeps nlohmann::ordered_map as the object type when used on ordered_json. Co-authored-by: Raphael Grimm <1005058+barcode@users.noreply.github.com> Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Fix with_t nav entry and document chaining of the with_*_t aliases Indent the with_t entry in mkdocs.yml so it is listed under basic_json, explain that the aliases can be chained and work on ordered_json, and test both, including json::with_object_t<ordered_map> == ordered_json. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Add docset entry for basic_json::with_t Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me> Co-authored-by: barcode <barcode@example.com> Co-authored-by: Raphael Grimm <1005058+barcode@users.noreply.github.com>
77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
#include <iostream>
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#include <nlohmann/json.hpp>
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class visitor_adaptor_with_metadata
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{
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public:
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template <class Fnc>
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void visit(const Fnc& fnc) const;
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int metadata = 42;
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private:
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template <class Ptr, class Fnc>
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void do_visit(const Ptr& ptr, const Fnc& fnc) const;
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};
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using json = nlohmann::json::with_base_class_t<visitor_adaptor_with_metadata>;
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template <class Fnc>
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void visitor_adaptor_with_metadata::visit(const Fnc& fnc) const
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{
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do_visit(json::json_pointer{}, fnc);
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}
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template <class Ptr, class Fnc>
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void visitor_adaptor_with_metadata::do_visit(const Ptr& ptr, const Fnc& fnc) const
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{
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using value_t = nlohmann::detail::value_t;
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const json& j = *static_cast<const json*>(this);
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switch (j.type())
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{
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case value_t::object:
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fnc(ptr, j);
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for (const auto& entry : j.items())
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{
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entry.value().do_visit(ptr / entry.key(), fnc);
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}
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break;
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case value_t::array:
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fnc(ptr, j);
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for (std::size_t i = 0; i < j.size(); ++i)
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{
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j.at(i).do_visit(ptr / std::to_string(i), fnc);
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}
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break;
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case value_t::null:
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case value_t::string:
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case value_t::boolean:
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case value_t::number_integer:
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case value_t::number_unsigned:
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case value_t::number_float:
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case value_t::binary:
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fnc(ptr, j);
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break;
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case value_t::discarded:
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default:
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break;
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}
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}
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int main()
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{
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// create a json object
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json j;
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j["null"];
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j["object"]["uint"] = 1U;
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j["object"].metadata = 21;
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// visit and output
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j.visit(
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[&](const json::json_pointer & p,
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const json & j)
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{
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std::cout << (p.empty() ? std::string{"/"} : p.to_string())
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<< " - metadata = " << j.metadata << " -> " << j.dump() << '\n';
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});
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}
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