std::range_error(3) C++ Standard Libary std::range_error(3) NAME std::range_error - std::range_error Synopsis Defined in header <stdexcept> class range_error; Defines a type of object to be thrown as exception. It can be used to report range errors (that is, situations where a result of a computation cannot be represented by the destination type). The only standard library components that throw this exception are std::wstring_convert::from_bytes and std::wstring_convert::to_bytes. The mathematical functions in the standard library components do not throw this exception (mathematical functions report range errors as specified in math_errhandling). std-range error-inheritance.svg Inheritance diagram Member functions constructor constructs a new range_error object with the given message (public member function) operator= replaces the range_error object (public member function) std::range_error::range_error range_error( const std::string& what_arg ); (1) range_error( const char* what_arg ); (2) range_error( const range_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::range_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::range_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 ob- ject and the copied object. std::range_error::operator= range_error& operator=( const range_error& other ); (noexcept since C++11) Assigns the contents with those of other. If *this and other both have dynamic type std::range_error then std::strcmp(what(), other.what()) == 0 after as- signment. 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 de- fined as long as the explanatory strings obtained by what() are the same for the orig- inal object and the copied object. Inherited from std::runtime_error 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 Correct behavior LWG 254 C++98 the constructor accepting const char* added was missing the explanatory strings of they are the same as that LWG 471 C++98 std::range_error's of the copies were implementation-defined original std::range_error object http://cppreference.com 2024.06.10 std::range_error(3)
NAME | Synopsis | Member functions | Parameters | Exceptions | Notes | Parameters | Return value | Notes | Member functions
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