std::ios_base::seekdir
From cppreference.com
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 |
[edit]Example
Run this code
#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!
[edit]See also
| sets the input position indicator (public member function of std::basic_istream<CharT,Traits>) | |
| sets the output position indicator (public member function of std::basic_ostream<CharT,Traits>) | |
| invokes seekoff() (public member function of std::basic_streambuf<CharT,Traits>) |
