<cstdio>

Object containing information to specify a position within a file

This type of object is used to specify a position within a file. An object of this type is capable of specifying uniquely the position within a file.

fpos_t objects are usually created by a call to fgetpos, which returns a reference to an object of this type.
The content of a fpos_t is not meant to be read directly, but only to use its reference as an argument in a call to fsetpos.