std::logic_error(3) C++ Standard Libary std::logic_error(3) NAME std::logic_error - std::logic_error Synopsis Defined in header <stdexcept> class logic_error; Defines a type of object to be thrown as exception. It reports errors that are a consequence of faulty logic within the program such as violating logical preconditions or class invariants and may be preventable. No standard library components throw this exception directly, but the exception types std::invalid_argument, std::domain_error, std::length_error, std::out_of_range, std::future_error, and std::experimental::bad_op- tional_access are derived from std::logic_error. std-logic error-inheritance.svg Inheritance diagram Member functions constructor constructs a new logic_error object with the given message (public member function) operator= replaces the logic_error object (public member function) std::logic_error::logic_error logic_error( const std::string& what_arg ); (1) logic_error( const char* what_arg ); (2) logic_error( const logic_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::logic_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::logic_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::logic_error::operator= logic_error& operator=( const logic_error& other ); (noexcept since C++11) Assigns the contents with those of other. If *this and other both have dynamic type std::logic_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::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::logic_error's of the copies were implementation-defined original std::logic_error object http://cppreference.com 2024.06.10 std::logic_error(3)
NAME | Synopsis | Member functions | Parameters | Exceptions | Notes | Parameters | Return value | Notes | Member functions
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