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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 er- rors that are due to events beyond the scope of the program and can not be easily pre- dicted. 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) std::runtime_error::runtime_error runtime_error( const std::string& what_arg ); (1) runtime_error( const char* what_arg ); (2) runtime_error( const runtime_error& other ); (3) (noexcept since C++11) 1) Constructs the exception object with what_arg as explanatory string. After construction, std::strcmp(what(), what_arg.c_str()) == 0. 2) Constructs the exception object with what_arg as explanatory string. After construction, std::strcmp(what(), what_arg) == 0. 3) Copy constructor. If *this and other both have dynamic type std::runtime_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 1,2) May throw std::bad_alloc. Notes Because copying std::runtime_error is not permitted to throw excep- tions, 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 con- struct 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::runtime_error::operator= 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. 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::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) Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior LWG 254 C++98 the constructor accepting const added char* was missing the explanatory strings of they are the same as that of LWG 471 C++98 std::runtime_error's the copies were implementation-defined original std::runtime_error object http://cppreference.com 2024.06.10 std::runtime_error(3)
NAME | Synopsis | Member functions | Parameters | Exceptions | Notes | Parameters | Return value | Notes | Member functions
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