nlohmann::basic_json::out_of_range

class out_of_range : public exception;

This exception is thrown in case a library function is called on an input parameter that exceeds the expected range, for instance, in the case of array indices or nonexisting object keys.

Exceptions have ids 4xx (see list of out-of-range errors).

Member functions

• what - returns explanatory string

Member variables

• id - the id of the exception

Examples

Example

The following code shows how a out_of_range exception can be caught.

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

using json = nlohmann::json;

int main()
{
    try
    {
        // calling at() for an invalid index
        json j = {1, 2, 3, 4};
        j.at(4) = 10;
    }
    catch (const json::out_of_range& e)
    {
        // output exception information
        std::cout << "message: " << e.what() << '\n'
                  << "exception id: " << e.id << std::endl;
    }
}

Output:

message: [json.exception.out_of_range.401] array index 4 is out of range
exception id: 401

See also

• List of out-of-range errors
• parse_error for exceptions indicating a parse error
• invalid_iterator for exceptions indicating errors with iterators
• type_error for exceptions indicating executing a member function with a wrong type
• other_error for exceptions indicating other library errors

Version history

• Since version 3.0.0.