nlohmann::operator""_json_pointer¶

json_pointer operator ""_json_pointer(const char* s, std::size_t n);

This operator implements a user-defined string literal for JSON Pointers. It can be used by adding _json_pointer to a string literal and returns a json_pointer object if no parse error occurred.

It is recommended to bring the operator into scope using any of the following lines:

using nlohmann::literals::operator ""_json_pointer;
using namespace nlohmann::literals;
using namespace nlohmann::json_literals;
using namespace nlohmann::literals::json_literals;
using namespace nlohmann;

Parameters¶

s (in)

a string representation of a JSON Pointer

n (in)

length of string s

Return value¶

json_pointer value parsed from s

Exceptions¶

The function can throw anything that json_pointer::json_pointer would throw.

Complexity¶

Linear.

Examples¶

#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>

using json = nlohmann::json;
using namespace nlohmann::literals;

int main()
{
    json j = R"( {"hello": "world", "answer": 42} )"_json;
    auto val = j["/hello"_json_pointer];

    std::cout << std::setw(2) << val << '\n';
}

"world"

See also¶

• json_pointer - type to represent JSON Pointers

Version history¶

• Added in version 2.0.0.
• Moved to namespace nlohmann::literals::json_literals in 3.11.0.