Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Set the open file.

void
reset(
    File&& file,
    error_code& ec);

This function is used to set the open file. Any previously set file will be closed.

Name	Description
`file`	The file to set. The file must be open or else an error occurs
`ec`	Set to the error, if any occurred