json/api/json_pointer/pop_back/index.md

nlohmann::json_pointer::pop_back

void pop_back();

Remove the last reference token.

Exception safety

Strong exception safety: if an exception occurs, the original value stays intact.

Exceptions

Throws out_of_range.405 if the JSON pointer has no parent.

Complexity

Constant.

Examples

Example

The example shows the usage of pop_back.

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

using json = nlohmann::json;

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

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

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

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

Output:

"/foo/bar/baz"
"/foo/bar"
"/foo"
""

See also

• back return last reference token
• push_back append an unescaped token at the end of the pointer
• parent_pointer returns the parent of this JSON pointer

Version history

Added in version 3.6.0.