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

basic_random_access_file::assign

Assign an existing native file to the file.

void assign(
    const native_handle_type & native_file);
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void assign(
    const native_handle_type & native_file,
    boost::system::error_code & ec);
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