![]() Namespace: std basic_istream::basic_istreamĬonstructs an object of type basic_istream. ![]() It's a move assignment involving an rvalue reference that doesn't leave a copy behind. ![]() Puts the most recently read character back into the stream.Ĭalls a function on the input stream or reads formatted data from the input stream.Īssigns the basic_istream on the right side of the operator to this object. Reports the current read position in the stream. Synchronizes the stream's associated input device with the stream's buffer. The nested class describes an object whose declaration structures the formatted input functions and the unformatted input functions.Įxchanges this basic_istream object for the provided basic_istream object parameter. Reads a specified number of characters from the stream and stores them in an array. Puts a specified character into the stream. Reads one or more characters from the input stream.Ĭauses a number of elements to be skipped from the current read position. Returns the number of characters read during the last unformatted input. Constructors ConstructorĬonstructs an object of type basic_istream. See the example for basic_ifstream Class to learn more about input streams. For more information, see basic_ios.Īn extraction count for the last unformatted input operation (called count in the previous code). For more information, see setstate.Ī virtual public base object of class basic_ios. They follow the pattern: iostate state = goodbit Ĭount = 0 // the value returned by gcountīoth groups of functions call setstate(eofbit) if they encounter end of file while extracting elements. ![]() Many other member functions are unformatted input functions. They follow the pattern: iostate state = goodbit Most of the member functions that overload operator> are formatted input functions. Syntax template >Ĭlass basic_istream : virtual public basic_ios If the operation sets an internal state flag that was registered with member exceptions, the function throws an exception of member type failure.Describes an object that controls extraction of elements and encoded objects from a stream buffer with elements of type Char_T, also known as char_type, whose character traits are determined by the class Tr, also known as traits_type. Multiple flags may be set by a single operation. When set, the integrity of the stream may have been affected. The construction of sentry failed (such as when the stream state was not good before the call).Įrror on stream (such as when this function catches an exception thrown by an internal operation). No character could be peeked because the input sequence has no characters available (end-of-file reached). If there are no more characters to read in the input sequence, or if any internal state flags is set, the function returns the end-of-file value ( EOF), and leaves the proper internal state flags set: The next character in the input sequence, as a value of type int. Then (if good), it reads one character from its associated stream buffer object by calling its member function sgetc, and finally destroys the sentry object before returning.Ĭalling this function sets the value returned by gcount to zero. Internally, the function accesses the input sequence by first constructing a sentry object (with noskipws set to true). If any internal state flags is already set before the call or is set during the call, the function returns the end-of-file value ( EOF). Returns the next character in the input sequence, without extracting it: The character is left as the next character to be extracted from the stream.
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