| 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) |
| Member functions | ||||
| Formatting | ||||
| Locales | ||||
| Internal extensible array | ||||
| Miscellaneous | ||||
| Member classes | ||||
| Member types | ||||
ios_base::seekdir | ||||
typedef/*implementation defined*/ seekdir; | ||
staticconstexpr seekdir beg=/*implementation defined*/ staticconstexpr seekdir end=/*implementation defined*/ | ||
Specifies file seeking direction type. The following constants are defined:
| Constant | Explanation |
| beg | the beginning of a stream |
| end | the ending of a stream |
| cur | the current position of stream position indicator |
#include <iostream>#include <sstream>#include <string> int main(){std::istringstream in("Hello, World!");std::string word1, word2, word3, word4, word5; in>> word1; in.seekg(0, std::ios_base::beg);// <- rewind in>> word2; in.seekg(1, std::ios_base::cur);// -> seek from cur pos toward the end in>> word3; in.seekg(-6, std::ios_base::cur);// <- seek from cur pos (end) toward begin in>> word4; in.seekg(-6, std::ios_base::end);// <- seek from end toward begin in>> word5; std::cout<<"word1 = "<< word1<<'\n'<<"word2 = "<< word2<<'\n'<<"word3 = "<< word3<<'\n'<<"word4 = "<< word4<<'\n'<<"word5 = "<< word5<<'\n';}
Output:
word1 = Hello,word2 = Hello,word3 = World!word4 = World!word5 = World!
| sets the input position indicator (public member function of std::basic_istream<CharT,Traits>)[edit] | |
| sets the output position indicator (public member function of std::basic_ostream<CharT,Traits>)[edit] | |
| invokesseekoff() (public member function of std::basic_streambuf<CharT,Traits>)[edit] |
