std::runtime_error
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:
| (since C++11) |
|
(since C++20) |
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) |
| (3) | ||
runtime_error( const runtime_error& other ); |
(until C++11) | |
runtime_error( const runtime_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::runtime_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::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
|
[virtual]
|
destroys the exception object (virtual public member function of std::exception) |
|
[virtual]
|
returns an explanatory string (virtual public member function of std::exception) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/error/runtime_error
