json/docs/examples/json_base_class_t.cpp
Niels Lohmann 6057b31df7
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Overwork astyle call (#4573)
* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* Use ubuntu-latest image to run Valgrind (#4575)

* 🔧 use Clang image to run valgrind

* 🔧 use Clang image to run valgrind

* 🔧 use Clang image to run valgrind

* 🔧 use Ubuntu image to run valgrind

* Use Clang image to run iwyu (#4574)

* 🔧 use Clang image to run iwyu

* 🔧 use Clang image to run iwyu

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🔧 overwork astyle call

* 🎨 format code

* 🔨 clean up
2024-12-29 17:06:03 +01:00

89 lines
2.2 KiB
C++

#include <iostream>
#include <nlohmann/json.hpp>
class visitor_adaptor_with_metadata
{
public:
template <class Fnc>
void visit(const Fnc& fnc) const;
int metadata = 42;
private:
template <class Ptr, class Fnc>
void do_visit(const Ptr& ptr, const Fnc& fnc) const;
};
using json = nlohmann::basic_json <
std::map,
std::vector,
std::string,
bool,
std::int64_t,
std::uint64_t,
double,
std::allocator,
nlohmann::adl_serializer,
std::vector<std::uint8_t>,
visitor_adaptor_with_metadata
>;
template <class Fnc>
void visitor_adaptor_with_metadata::visit(const Fnc& fnc) const
{
do_visit(json::json_pointer{}, fnc);
}
template <class Ptr, class Fnc>
void visitor_adaptor_with_metadata::do_visit(const Ptr& ptr, const Fnc& fnc) const
{
using value_t = nlohmann::detail::value_t;
const json& j = *static_cast<const json*>(this);
switch (j.type())
{
case value_t::object:
fnc(ptr, j);
for (const auto& entry : j.items())
{
entry.value().do_visit(ptr / entry.key(), fnc);
}
break;
case value_t::array:
fnc(ptr, j);
for (std::size_t i = 0; i < j.size(); ++i)
{
j.at(i).do_visit(ptr / std::to_string(i), fnc);
}
break;
case value_t::null:
case value_t::string:
case value_t::boolean:
case value_t::number_integer:
case value_t::number_unsigned:
case value_t::number_float:
case value_t::binary:
fnc(ptr, j);
break;
case value_t::discarded:
default:
break;
}
}
int main()
{
// create a json object
json j;
j["null"];
j["object"]["uint"] = 1U;
j["object"].metadata = 21;
// visit and output
j.visit(
[&](const json::json_pointer & p,
const json & j)
{
std::cout << (p.empty() ? std::string{"/"} : p.to_string())
<< " - metadata = " << j.metadata << " -> " << j.dump() << '\n';
});
}