NAME¶

std::ios_base::seekdir - std::ios_base::seekdir

Synopsis¶

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:

Constant Explanation
beg the beginning of a stream
end the ending of a stream
cur the current position of stream position indicator

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!

See also¶

seekg sets the input position indicator
(public member function of std::basic_istream<CharT,Traits>)
seekp sets the output position indicator
(public member function of std::basic_ostream<CharT,Traits>)
pubseekoff invokes seekoff()
(public member function of std::basic_streambuf<CharT,Traits>)