std::ios_base::seekdir - cppreference.com (original) (raw)

| typedef /*implementation defined*/ seekdir; | | | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | | static constexpr seekdir beg = /*implementation defined*/ static constexpr seekdir end = /*implementation defined*/ static constexpr seekdir cur = /*implementation defined*/ | | |

Specifies file seeking direction type. The following constants are defined:

[edit] Example

#include #include #include   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>) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | sets the output position indicator (public member function of std::basic_ostream<CharT,Traits>) [edit] | | | invokes seekoff() (public member function of std::basic_streambuf<CharT,Traits>) [edit] |