std::exception
(C++17)<exception>
Provides consistent interface to handle errors through the throw expression.
All exceptions generated by the standard library inherit from std::exception.
All member functions of std::exception are constexpr.
Contents
[edit] Member functions
[edit] Standard exception requirements
Each standard library class T that derives from std::exception has the following publicly accessible member functions, each of them do not exit with an exception(until C++11)having a non-throwing exception specification (since C++11):
- default constructor (unless other constructors are provided)
- copy constructor
- copy assignment operator
The copy constructor and the copy assignment operator meet the following postcondition:
- If two objects lhs and rhs both have dynamic type
Tand lhs is a copy of rhs, then std::strcmp (lhs.what(), rhs.what()) is equal to 0.
The what() member function of each such T satisfies the constraints specified for std::exception::what() .
[edit] Standard exceptions
[edit] Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_constexpr_exceptions |
202411L |
(C++26) | constexpr for exception types |
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 471 | C++98 | there was no requirement on standard library classes derived from std::exception
|
added |