nlohmann::basic_json::invalid_iterator¶

classinvalid_iterator:publicexception;

This exception is thrown if iterators passed to a library function do not match the expected semantics.

Exceptions have ids 2xx (see list of iterator errors).

classDiagram
 direction LR
 class std_exception ["std::exception"] {
 <<interface>>
 }
 class json_exception ["basic_json::exception"] {
 +const int id
 +const char* what() const
 }
 class json_parse_error ["basic_json::parse_error"] {
 +const std::size_t byte
 }
 class json_invalid_iterator ["basic_json::invalid_iterator"]
 class json_type_error ["basic_json::type_error"]
 class json_out_of_range ["basic_json::out_of_range"]
 class json_other_error ["basic_json::other_error"]
 std_exception <|-- json_exception
 json_exception <|-- json_parse_error
 json_exception <|-- json_invalid_iterator
 json_exception <|-- json_type_error
 json_exception <|-- json_out_of_range
 json_exception <|-- json_other_error
 style json_invalid_iterator fill:#CCCCFF

Member functions¶

• what - returns explanatory string

Member variables¶

• id - the id of the exception

Examples¶

#include<iostream>
#include<nlohmann/json.hpp>
usingjson=nlohmann::json;
intmain()
{
try
{
// calling iterator::key() on non-object iterator
jsonj="string";
json::iteratorit=j.begin();
autok=it.key();
}
catch(constjson::invalid_iterator&e)
{
// output exception information
std::cout<<"message: "<<e.what()<<'\n'
<<"exception id: "<<e.id<<std::endl;
}
}

message:[json.exception.invalid_iterator.207]cannotusekey()fornon-objectiterators
exceptionid:207

See also¶

• exception for the base class of all exceptions thrown by the library
• List of iterator errors
• parse_error for exceptions indicating a parse error
• type_error for exceptions indicating executing a member function with a wrong type
• out_of_range for exceptions indicating access out of the defined range
• other_error for exceptions indicating other library errors

Version history¶

• Since version 3.0.0.