| I/O manipulators | ||||
| Print functions(C++23) | ||||
| C-style I/O | ||||
| Buffers | ||||
(C++23) | ||||
(C++98/26*) | ||||
(C++20) | ||||
| Streams | ||||
| Abstractions | ||||
| File I/O | ||||
| String I/O | ||||
| Array I/O | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
(C++98/26*) | ||||
(C++98/26*) | ||||
(C++98/26*) | ||||
| Synchronized Output | ||||
(C++20) | ||||
| Types | ||||
| Error category interface | ||||
(C++11) | ||||
(C++11) |
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std::streamsize sgetn( char_type* s,std::streamsize count); | (1) | |
protected: virtualstd::streamsize xsgetn( char_type* s,std::streamsize count); | (2) | |
xsgetn(s, count) of the most derived class.count characters from the input sequence and stores them into a character array pointed to bys. The characters are read as if by repeated calls tosbumpc(). That is, if less thancount characters are immediately available, the function callsuflow() to provide more untilTraits::eof() is returned.std::basic_streambuf are permitted to provide more efficient implementations of this function.Contents |
| s | - | pointer to the beginning of a char_type array |
| count | - | maximum number of characters to read. |
The number of characters successfully read. If it is less thancount the input sequence has reached the end.
The rule about "more efficient implementations" permits bulk I/O without intermediate buffering: that's howstd::ifstream::read simply passes the pointer to the POSIXread() system call in some implementations of iostreams
| This section is incomplete Reason: no example |
| invokesxsputn() (public member function)[edit] |
