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# nlohmann::json_pointer::push_back

    void push_back(const string_t& token);

    void push_back(string_t&& token);

Append an unescaped token at the end of the reference pointer.

## Parameters

`token` (in)
  token to add

## Complexity

Amortized constant.

## Examples

Example

The example shows the result of `push_back` for different JSON Pointers.

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

    using json = nlohmann::json;

    int main()
    {
        // create empty JSON Pointer
        json::json_pointer ptr;
        std::cout << "\"" << ptr << "\"\n";

        // call push_back()
        ptr.push_back("foo");
        std::cout << "\"" << ptr << "\"\n";

        ptr.push_back("0");
        std::cout << "\"" << ptr << "\"\n";

        ptr.push_back("bar");
        std::cout << "\"" << ptr << "\"\n";
    }

Output:

    ""
    "/foo"
    "/foo/0"
    "/foo/0/bar"

## Version history

- Added in version 3.6.0.
- Changed type of `token` to `string_t` in version 3.11.0.

Last update: May 1, 2022
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