std::domain_error
Defined in header <stdexcept> |
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class domain_error; |
Defines a type of object to be thrown as exception. It may be used by the implementation to report domain errors, that is, situations where the inputs are outside of the domain on which an operation is defined.
The standard library components do not throw this exception (mathematical functions report domain errors as specified in math_errhandling). Third-party libraries, however, use this. For example, boost.math throws std::domain_error if boost::math::policies::throw_on_error is enabled (the default setting).
Inheritance diagram.
Member functions
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(constructor)
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constructs a new domain_error object with the given message (public member function) |
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operator=
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replaces the domain_error object (public member function) |
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what
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returns the explanatory string (public member function) |
std::domain_error::domain_error
domain_error( const std::string& what_arg ); |
(1) | |
domain_error( const char* what_arg ); |
(2) | (since C++11) |
| (3) | ||
domain_error( const domain_error& other ); |
(until C++11) | |
domain_error( const domain_error& other ) noexcept; |
(since C++11) |
what_arg as explanatory string that can be accessed through
what().
*this and other both have dynamic type std::domain_error then std::strcmp(what(), other.what()) == 0. (since C++11)
Parameters
| what_arg | - | explanatory string |
| other | - | another exception object to copy |
Exceptions
std::bad_alloc
Notes
Because copying std::domain_error is not permitted to throw exceptions, this message is typically stored internally as a separately-allocated reference-counted string. This is also why there is no constructor taking std::string&&: it would have to copy the content anyway.
std::domain_error::operator=
domain_error& operator=( const domain_error& other ); |
(until C++11) | |
domain_error& operator=( const domain_error& other ) noexcept; |
(since C++11) |
Assigns the contents with those of other. If *this and other both have dynamic type std::domain_error then std::strcmp(what(), other.what()) == 0 after assignment. (since C++11).
Parameters
| other | - | another exception object to assign with |
Return value
*this.
std::domain_error::what
virtual const char* what() const throw(); |
(until C++11) | |
virtual const char* what() const noexcept; |
(since C++11) |
Returns the explanatory string.
Parameters
(none).
Return value
Pointer to a null-terminated string with explanatory information. The string is suitable for conversion and display as a std::wstring. The pointer is guaranteed to be valid at least until the exception object from which it is obtained is destroyed, or until a non-const member function (e.g. copy assignment operator) on the exception object is called.
Notes
Implementations are allowed but not required to override what().
Inherited from std::logic_error
Inherited from std::exception
Member functions
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[virtual]
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destroys the exception object (virtual public member function of std::exception) |
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[virtual]
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returns an explanatory string (virtual public member function of std::exception) |
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