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nlohmann::json_pointer::back

const string_t& back() const;

Return last reference token.

Return value

Last reference token.

Exceptions

Throws out_of_range.405 if JSON pointer has no parent.

Complexity

Constant.

Examples

Example

The example shows the usage of back.

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

using json = nlohmann::json;

int main()
{
    // different JSON Pointers
    json::json_pointer ptr1("/foo");
    json::json_pointer ptr2("/foo/0");

    // call empty()
    std::cout << "last reference token of " << ptr1 << " is " << ptr1.back() << '\n'
              << "last reference token of " << ptr2 << " is " << ptr2.back() << std::endl;
}

Output:

last reference token of "/foo" is foo
last reference token of "/foo/0" is 0

Version history

  • Added in version 3.6.0.
  • Changed return type to string_t in version 3.11.0.

Last update: May 1, 2022
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