The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
std::ios_base::pword – std::ios_base::pword Synopsis void *&pword(int index); First, allocates or resizes the private storage (dynamic array of void* or another indexable data structure) sufficiently to make index a valid index, then returns a reference to the void* element of the private storage with the index index. The reference may be invalidated by any operation on…
std::ios_base::precision – std::ios_base::precision Synopsis streamsize precision() const; (1) streamsize precision( streamsize new_precision ); (2) Manages the precision (i.e. how many digits are generated) of floating point output performed by std::num_put::do_put. 1) Returns the current precision. 2) Sets the precision to the given one. Returns the previous precision. The default precision, as established by std::basic_ios::init, is…
std::ios_base::openmode – std::ios_base::openmode Synopsis typedef /*implementation defined*/ openmode; static constexpr openmode app = /*implementation defined*/ static constexpr openmode binary = /*implementation defined*/ static constexpr openmode in = /*implementation defined*/ static constexpr openmode out = /*implementation defined*/ static constexpr openmode trunc = /*implementation defined*/ static constexpr openmode ate = /*implementation defined*/ Specifies available file open flags….
std::ios_base::iword – std::ios_base::iword Synopsis long &iword(int index); First, allocates or resizes the private storage (dynamic array of long or another indexable data structure) sufficiently to make index a valid index, then returns a reference to the long element of the private storage with the index index. The reference may be invalidated by any operation on…
std::ios_base::iostate – std::ios_base::iostate Synopsis typedef /*implementation defined*/ iostate; static constexpr iostate goodbit = 0; static constexpr iostate badbit = /*implementation defined*/ static constexpr iostate failbit = /*implementation defined*/ static constexpr iostate eofbit = /*implementation defined*/ Specifies stream state flags. It is a BitmaskType, the following constants are defined: Constant Explanation goodbit no error badbit irrecoverable…
std::ios_base::~ios_base – std::ios_base::~ios_base Synopsis virtual ~ios_base(); Destroys the ios_base object. Before any of the member functions would yield undefined results, calls callbacks, registered by register_callback() passing erase_event as parameter. No operations on rdbuf are performed, it is not destroyed.
std::ios_base::imbue – std::ios_base::imbue Synopsis std::locale imbue(const std::locale &loc); Sets the associated locale of the stream to the given one. Before returning, each function, registered by register_callback() is called with imbue_event as a parameter. Parameters loc – new locale to associate the stream to Return value The locale object, associated with the stream before the operation…
std::ios_base::getloc – std::ios_base::getloc Synopsis std::locale getloc() const; Returns the current locale associated with the stream. Parameters (none) Return value the locale object associated with the stream. Example // Run this code #include <iostream> #include <ctime> #include <iomanip> #include <codecvt> int main() { std::wbuffer_convert<std::codecvt_utf8<wchar_t>> conv(std::cout.rdbuf()); std::wostream out(&conv); out.imbue(std::locale(out.getloc(), new std::time_put_byname<wchar_t>("ja_JP"))); std::time_t t = std::time(NULL); out <<…
std::ios_base::fmtflags – std::ios_base::fmtflags Synopsis typedef /*implementation defined*/ fmtflags; static constexpr fmtflags dec = /*implementation defined*/ static constexpr fmtflags oct = /*implementation defined*/ static constexpr fmtflags hex = /*implementation defined*/ static constexpr fmtflags basefield = dec | oct | hex; static constexpr fmtflags left = /*implementation defined*/ static constexpr fmtflags right = /*implementation defined*/ static constexpr…
std::ios_base::flags – std::ios_base::flags Synopsis fmtflags flags() const; (1) fmtflags flags( fmtflags flags ); (2) Manages format flags. 1) returns current formatting setting 2) replaces current settings with given ones. Parameters new formatting setting. It can be a combination of the following constants: Constant Explanation dec use decimal base for integer I/O: see std::dec oct use…
std::ios_base::failure – std::ios_base::failure Synopsis Defined in header <ios> class failure; The class std::ios_base::failure defines an exception object that is thrown on failure by the functions in the Input/Output library. std::ios_base::failure may be defined either as a member class of std::ios_base or as a synonym (typedef) for another class with equivalent functionality. (since C++17) std-ios base-failure-2003-inheritance.svg…
std::ios_base::event_callback – std::ios_base::event_callback Synopsis typedef void (*event_callback)(event type, ios_base &ios, int index); The type of function callbacks that can be registered using register_callback() to be called on specific events. type is a value of type ios_base::event which indicates the type of the event that will invoke this callback. ios refers to the stream object for…
std::ios_base::event – std::ios_base::event Synopsis enum event {erase_event, imbue_event, copyfmt_event}; Specifies the event type which is passed to functions registered by register_callback() on specific events. The following constants are defined: Constant Explanation erase_event issued on ~ios_base() or basic_ios::copyfmt() (before the copy of members takes place) imbue_event issued on imbue() copyfmt_event issued on basic_ios::copyfmt() (after the copy…
std::ios_base::Init – std::ios_base::Init Synopsis class Init; This class is used to ensure that the default C++ streams (std::cin, std::cout, etc.) are properly initialized and destructed. The class tracks how many instances of it are created and initializes the C++ streams when the first instance is constructed as well as flushes the output streams when the…
std::ios_base – std::ios_base Synopsis Defined in header <ios> class ios_base; The class ios_base is a multipurpose class that serves as the base class for all I/O stream classes. It maintains several kinds of data: 1) state information: stream status flags 2) control information: flags that control formatting of both input and output sequences and the…
std::basic_ios – std::basic_ios Synopsis Defined in header <ios> template< class CharT, class Traits = std::char_traits<CharT> > class basic_ios : public std::ios_base The class std::basic_ios provides facilities for interfacing with objects that have std::basic_streambuf interface. Several std::basic_ios objects can refer to one actual std::basic_streambuf object. std-basic ios-inheritance.svg Inheritance diagram Two specializations for common character types are…
std::io_errc – std::io_errc Synopsis Defined in header <ios> enum class io_errc { stream = 1, (since C++11) }; The scoped enumeration std::io_errc defines the error codes reported by I/O streams in std::ios_base::failure exception objects. Only one error code (std::io_errc::stream) is required, although the implementation may define additional error codes. Because the appropriate specialization of std::is_error_code_enum…
std::invoke – std::invoke Synopsis Defined in header <functional> template< class F, class… Args> (since C++17) std::invoke_result_t<F, Args…> invoke(F&& f, Args&&… args) noexcept(/* see below */); Invoke the Callable object f with the parameters args. As by INVOKE(std::forward<F>(f), std::forward<Args>(args)…). where INVOKE(f, t1, t2, …, tN) is defined as follows: * If f is a pointer_to_member_function of…
std::invalid_argument – std::invalid_argument Synopsis Defined in header <stdexcept> class invalid_argument; Defines a type of object to be thrown as exception. It reports errors that arise because an argument value has not been accepted. This exception is thrown by std::bitset::bitset, and the std::stoi and std::stof families of functions. std-invalid argument-inheritance.svg Inheritance diagram Member functions constructs the…
std::integral_constant – std::integral_constant Synopsis Defined in header<type_traits> template <class T, T v> (since C++ 11) struct integral_constant; std::integral_constant wraps a static constant of specified type. It is the base class for the C++ type traits. Helper templates A helper alias template std::bool_constant is defined for the common case where T is bool. (since C++17) template…