std::basic_filebuf<CharT,Traits>:: native_handle

From cppreference.com
native_handle_type native_handle ( ) const noexcept ;
(since C++26)

Returns the implementation defined underlying handle associated with * this . The behavior is undefined if is_open ( ) is false .

Return value

implementation defined handle.

Notes

Feature-test macro Value Std Feature
__cpp_lib_fstream_native_handle 202306L (C++26) native handles support

Example