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.
(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) |
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)
what_arg | - | explanatory string |
other | - | another exception object to copy |
std::bad_alloc
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.
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).
other | - | another exception object to assign with |
*this
.
virtual const char* what() const throw(); | (until C++11) | |
virtual const char* what() const noexcept; | (since C++11) |
Returns the explanatory string.
(none).
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.
Implementations are allowed but not required to override what()
.
[virtual] | destroys the exception object (virtual public member function of std::exception ) |
[virtual] | returns an explanatory string (virtual public member function of std::exception ) |
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