std::basic_istream<CharT,Traits>:: tellg
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pos_type tellg
(
)
;
|
||
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 ) .
Parameters
(none)
Return value
The current position of the get pointer on success, pos_type ( - 1 ) on failure.
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.
Example
#include <iostream> #include <sstream> #include <string> 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
See also
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[virtual]
|
repositions the file position, using relative addressing
(virtual protected member function of
std::basic_filebuf<CharT,Traits>
)
|
|
[virtual]
|
repositions the next pointer in the input sequence, output sequence, or both, using relative addressing
(virtual protected member function of
std::basic_stringbuf<CharT,Traits,Allocator>
)
|
|
[virtual]
|
repositions the next pointer in the input sequence, output sequence, or both, using relative addressing
(virtual protected member function of
std::strstreambuf
)
|
|
sets the input position indicator
(public member function) |
|
|
returns the output position indicator
(public member function of
std::basic_ostream<CharT,Traits>
)
|
|
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sets the output position indicator
(public member function of
std::basic_ostream<CharT,Traits>
)
|