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Member functions | ||||
exception::exception | ||||
(1) | ||
exception()throw(); | (until C++11) | |
exception()noexcept; | (since C++11) (constexpr since C++26) | |
(2) | ||
exception(const exception& other)throw(); | (until C++11) | |
exception(const exception& other)noexcept; | (since C++11) (constexpr since C++26) | |
Constructs new exception object.
std::exception
thenstd::strcmp(what(), other.what())==0.other | - | another exception to assign the contents of |
Because copyingstd::exception
is not permitted to throw exceptions, when derived classes (such asstd::runtime_error) have to manage a user-defined diagnostic message, it is typically implemented as a copy-on-write string.
The Microsoft implementation includes non-standard constructors taking strings thus allowing instances to be thrown directly with a meaningful error message. The nearest standard equivalents arestd::runtime_error orstd::logic_error.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
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LWG 471 | C++98 | there is no requirement onwhat() of the exception copy | added |