std:: domain_error
|
Defined in header
<stdexcept>
|
||
|
class
domain_error
;
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||
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
|
(constructor)
|
constructs a new
domain_error
object with the given message
(public member function) |
|
operator=
|
replaces the
domain_error
object
(public member function) |
std::domain_error:: domain_error
|
domain_error
(
const
std::
string
&
what_arg
)
;
|
(1) | |
|
domain_error
(
const
char
*
what_arg
)
;
|
(2) | |
|
domain_error
(
const
domain_error
&
other
)
;
|
(3) | (noexcept since C++11) |
std::domain_error
then
std::
strcmp
(
what
(
)
, other.
what
(
)
)
==
0
. No exception can be thrown from the copy constructor.
Parameters
| what_arg | - | explanatory string |
| other | - | another exception object to copy |
Exceptions
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.
Before the resolution of LWG issue 254 , the non-copy constructor can only accept std::string . It makes dynamic allocation mandatory in order to construct a std::string object.
After the resolution of
LWG issue 471
, a derived standard exception class must have a publicly accessible copy constructor. It can be implicitly defined as long as the explanatory strings obtained by
what()
are the same for the original object and the copied object.
std::domain_error:: operator=
|
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. No exception can be thrown from the copy assignment operator.
Parameters
| other | - | another exception object to assign with |
Return value
* this
Notes
After the resolution of
LWG issue 471
, a derived standard exception class must have a publicly accessible copy assignment operator. It can be implicitly defined as long as the explanatory strings obtained by
what()
are the same for the original object and the copied object.
Inherited from std:: logic_error
Inherited from std:: exception
Member functions
|
[virtual]
|
destroys the exception object
(virtual public member function of
std::exception
)
|
|
[virtual]
|
returns an explanatory string
(virtual public member function of
std::exception
)
|
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 254 | C++98 | the constructor accepting const char * was missing | added |
| LWG 471 | C++98 |
the explanatory strings of
std::domain_error
's
copies were implementation-defined |
they are the same as that of the
original
std::domain_error
object
|