Difference between revisions of "cpp/error/exception/exception"
From cppreference.com
(merge noexcept/throw(), LWG 471) |
(Non-standard Microsft ctors.) |
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===Notes=== | ===Notes=== | ||
Because copying {{tt|std::exception}} is not permitted to throw exceptions, when derived classes (such as {{lc|std::runtime_error}}) have to manage a user-defined diagnostic message, it is typically implemented as a copy-on-write string. | Because copying {{tt|std::exception}} is not permitted to throw exceptions, when derived classes (such as {{lc|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 {{lc|std::runtime_error}} or {{lc|std::logic_error}}. | ||
{{langlinks|de|es|fr|it|ja|pt|ru|zh}} | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | ||
Revision as of 23:57, 9 August 2021
| (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.
1) Default constructor. what() returns an implementation-defined string.
2) Copy constructor. Initializes the contents with those of
other. If *this and other both have dynamic type std::exception then std::strcmp(what(), other.what()) == 0.(since C++11)Parameters
| other | - | another exception to assign the contents of |
Notes
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.
