| (1) | ||
exception() throw(); | (until C++11) | |
exception() noexcept; | (since C++11) | |
| (2) | ||
exception( const exception& other ) throw(); | (until C++11) | |
exception( const exception& other ) noexcept; | (since C++11) |
Constructs new exception object.
what() returns an implementation-defined string.other. If *this and other both have dynamic type std::exception then std::strcmp(what(), other.what()) == 0.| other | - | another exception to assign the contents of |
Because copying std::exception is not permitted to throw exceptions, when derived classes (such as std::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 are std::runtime_error or std::logic_error.
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 is no requirement on what() of the exception copy | added |
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