Function libgit2_sys::git_diff_foreach

pub unsafe extern fn git_diff_foreach(diff: *mut git_diff, file_cb: git_diff_file_cb, binary_cb: Option<git_diff_binary_cb>, hunk_cb: Option<git_diff_hunk_cb>, line_cb: Option<git_diff_line_cb>, payload: *mut c_void) -> c_int