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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) what returns the explanatory string (public member function) std::format_error::format_error format_error( const std::string& what_arg ); (1) (since C++20) format_error( const char* what_arg ); (2) (since C++20) format_error( const format_error& other ) noexcept; (3) (since C++20) 1-2) Constructs the exception object with what_arg as explanatory string that can be accessed through what(). 3) Copy constructor. If *this and other both have dynamic type std::format_error then std::strcmp(what(), other.what()) == 0. 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. std::format_error::operator= format_error& operator=( const format_error& other ) noexcept; (since C++20) 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. Parameters other - another exception object to assign with Return value *this std::format_error::what virtual const char* what() const noexcept; (since C++20) Returns the explanatory string. Parameters (none) Return value 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 ob- tained is destroyed, or until a non-const member function (e.g. copy assignment operator) on the exception object is called. Notes Implementations are allowed but not required to override what(). 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 http://cppreference.com 2022.07.31 std::format_error(3)
NAME | Synopsis | Member functions | Parameters | Exceptions | Notes | Parameters | Return value | Parameters | Return value | Notes | Member functions | Example | See also
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