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 |
#include <iostream>
#include <string>
#include <sstream>
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>) |
|
| 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>) |
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