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std::format_error(3) C++ Standard Libary std::format_error(3) NAME std::format_error - std::format_error Synopsis Defined in header <format> class format_error; (since C++20) Defines the type of exception object thrown to report errors in the formatting library. std-format error-inheritance.svg Inheritance diagram Member functions constructor constructs a new format_error object with the given message (public member function) operator= replaces the format_error object (public member function) std::format_error::format_error format_error( const std::string& what_arg ); (1) format_error( const char* what_arg ); (2) format_error( const format_error& other ) noexcept; (3) 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::format_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::format_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. A derived standard exception class must have a publicly accessible copy constructor. It can be implicitly defined as long as the explanatory strings ob- tained by what() are the same for the original object and the copied object. std::format_error::operator= format_error& operator=( const format_error& other ) noexcept; Assigns the contents with those of other. If *this and other both have dynamic type std::format_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 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 ob- ject. 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) Example This section is incomplete Reason: no example See also Category: * Todo no example http://cppreference.com 2024.06.10 std::format_error(3)
NAME | Synopsis | Member functions | Parameters | Exceptions | Notes | Parameters | Return value | Notes | Member functions | Example | See also | Category:
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