std::basic_istream::tellg
From cppreference.com
< cpp | io | basic istream
| pos_type tellg(); |
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Returns input position indicator of the current associated streambuf object.
Behaves as UnformattedInputFunction, except that gcount() is not affected. After constructing and checking the sentry object, if fail() == true, returns pos_type(-1). Otherwise, returns rdbuf()->pubseekoff(0, std::ios_base::cur, std::ios_base::in).
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[edit] Parameters
(none)
[edit] Return value
The current position of the get pointer on success, pos_type(-1) on failure
[edit] Exceptions
If an internal operation throws an exception, it is caught and badbit is set. If exceptions() is set for badbit, the exception is rethrown.
[edit] Example
Run this code
#include <iostream> #include <string> #include <sstream> int main() { std::string str = "Hello, world"; std::istringstream in(str); std::string word; in >> word; std::cout << "After reading the word \"" << word << "\" tellg() returns " << in.tellg() << '\n'; }
Output:
After reading the word "Hello," tellg() returns 6
[edit] See also
| [virtual] |
repositions the file position, using relative addressing (virtual protected member function of std::basic_filebuf)
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| [virtual] |
repositions the next pointer in the input sequence, output sequence, or both, using relative addressing (virtual protected member function of std::basic_stringbuf)
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| [virtual] |
repositions the next pointer in the input sequence, output sequence, or both, using relative addressing (virtual protected member function of std::strstreambuf)
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| sets the input position indicator (public member function) | |
| returns the output position indicator (public member function of std::basic_ostream)
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| sets the output position indicator (public member function of std::basic_ostream)
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