1# basic_json::exception 2 3```cpp 4class exception : public std::exception; 5``` 6 7This class is an extension of [`std::exception`](https://en.cppreference.com/w/cpp/error/exception) objects with a 8member `id` for exception ids. It is used as the base class for all exceptions thrown by the `basic_json` class. This 9class can hence be used as "wildcard" to catch exceptions, see example below. 10 11```plantuml 12std::exception <|-- basic_json::exception 13basic_json::exception <|-- basic_json::parse_error 14basic_json::exception <|-- basic_json::invalid_iterator 15basic_json::exception <|-- basic_json::type_error 16basic_json::exception <|-- basic_json::out_of_range 17basic_json::exception <|-- basic_json::other_error 18 19interface std::exception {} 20 21class basic_json::exception #FFFF00 { 22 + const int id 23 + const char* what() const 24} 25 26class basic_json::parse_error { 27 + const std::size_t byte 28} 29``` 30 31Subclasses: 32 33- [`parse_error`](parse_error.md) for exceptions indicating a parse error 34- [`invalid_iterator`](invalid_iterator.md) for exceptions indicating errors with iterators 35- [`type_error`](type_error.md) for exceptions indicating executing a member function with a wrong type 36- [`out_of_range`](out_of_range.md) for exceptions indicating access out of the defined range 37- [`other_error`](other_error.md) for exceptions indicating other library errors 38 39## Member functions 40 41- **what** - returns explanatory string 42 43## Member variables 44 45- **id** - the id of the exception 46 47## Example 48 49??? example 50 51 The following code shows how arbitrary library exceptions can be caught. 52 53 ```cpp 54 --8<-- "examples/exception.cpp" 55 ``` 56 57 Output: 58 59 ```json 60 --8<-- "examples/exception.output" 61 ``` 62 63## Version history 64 65- Since version 3.0.0. 66