std::basic_filebuf::seekpos
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virtual pos_type seekpos( pos_type sp, |
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Repositions the file pointer, if possible, to the position indicated by sp.
If the associated file is not open (is_open()==false), fails immediately.
If the file is open for writing, first writes the put area and any unshift sequences required by the currently imbued locale, using overflow()
Then repositions the file pointer, as by calling std::fseek
If the file is open for reading, updates the get area if necessary.
If sp was not obtained by calling seekoff() or seekpos() on the same file, the behavior is undefined.
Contents |
[edit] Parameters
| sp | - | file position obtained by seekoff() or seekpos() called earlier on the same file | ||||||||||||
| which | - | defines which of the input and/or output sequences to affect. It can be one or a combination of the following constants:
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[edit] Return value
sp on success or pos_type(off_type(-1)) on failure.
[edit] Notes
seekpos() is called by std::basic_streambuf::pubseekpos, which is called by the single-argument versions of std::basic_istream::seekg and std::basic_ostream::seekp
[edit] Example
| This section is incomplete Reason: no example |
[edit] See also
| invokes seekpos() (public member function of std::basic_streambuf) |
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| [virtual]
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repositions the file position, using relative addressing (virtual protected member function) |
| moves the file position indicator to a specific location in a file (function) |
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