std::runtime_error(3) | C++ Standard Libary | std::runtime_error(3) |
NAME¶
std::runtime_error - std::runtime_error
Synopsis¶
Defined in header <stdexcept>
class runtime_error;
Defines a type of object to be thrown as exception. It reports errors that
are due
to events beyond the scope of the program and can not be easily
predicted.
Exceptions of type std::runtime_error are thrown by the following standard
library
components: std::locale::locale and std::locale::combine.
In addition, the following standard exception types are derived from
std::runtime_error:
* std::range_error
* std::overflow_error
* std::underflow_error
* std::regex_error (since C++11)
* std::system_error
* std::chrono::ambiguous_local_time
* std::chrono::nonexistent_local_time (since C++20)
* std::format_error
std-runtime error-inheritance.svg
Inheritance diagram
Member functions¶
constructor constructs a new runtime_error object with the given
message
(public member function)
operator= replaces the runtime_error object
(public member function)
what returns the explanatory string
(public member function)
std::runtime_error::runtime_error
runtime_error( const std::string& what_arg ); (1)
runtime_error( const char* what_arg ); (2) (since C++11)
runtime_error( const runtime_error& other ); (until C++11)
runtime_error( const runtime_error& other ) (3) (since
C++11)
noexcept;
1-2) Constructs the exception object with what_arg as explanatory string that
can be
accessed through what().
3) Copy constructor.
If *this and other both have dynamic type std::runtime_error then
std::strcmp(what(), other.what()) == 0.
(since C++11)
Parameters¶
what_arg - explanatory string
other - another exception object to copy
Exceptions¶
1-2) May throw std::bad_alloc
Notes¶
Because copying std::runtime_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::runtime_error::operator=
runtime_error& operator=( const runtime_error& other ); (until
C++11)
runtime_error& operator=( const runtime_error& other ) noexcept;
(since C++11)
Assigns the contents with those of other.
If *this and other both have dynamic type std::runtime_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::runtime_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::exception
Member functions¶
destructor destroys the exception object
[virtual] (virtual public member function of std::exception)
what returns an explanatory string
[virtual] (virtual public member function of
std::exception)
2022.07.31 | http://cppreference.com |