From cppreference.com
typedef/*implementation defined*/seekdir;staticconstexprseekdirbeg=/*implementation defined*/staticconstexprseekdirend=/*implementation defined*/staticconstexprseekdircur=/*implementation defined*/Specifies file seeking direction type. The following constants are defined:
Constant Explanation
the beginning of a stream
the ending of a stream
the current position of stream position indicator Example
Run this code
#include<iostream>#include<sstream>#include<string>intmain(){std::istringstreamin("Hello, World!");std::stringword1,word2,word3,word4,word5;in>>word1;in.seekg(0,std::ios_base::beg);// <- rewindin>>word2;in.seekg(1,std::ios_base::cur);// -> seek from cur pos toward the endin>>word3;in.seekg(-6,std::ios_base::cur);// <- seek from cur pos (end) toward beginin>>word4;in.seekg(-6,std::ios_base::end);// <- seek from end toward beginin>>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! 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>)