As the error implies, the function type that you try to pass as a callback is incorrect.
The problem is that because the callback is called from C it ought to be "compatible" with C, thus the "extern" bit. Rather than defining an anonymous function, you need to write an "extern fn" function (with a name), so that the function (at low-level) have a compatible ABI with C. -- Matthieu On Sat, May 11, 2013 at 3:04 AM, Skirmantas Kligys < skirmantas.kli...@gmail.com> wrote: > I am trying to write a native wrapper for > > https://github.com/pascalj/rust-expat > > (BTW, if there is a native Rust XML parser, I am interested to hear > about it, did not find it). I have trouble calling back into Rust > from C code: > > fn set_element_handlers(parser: expat::XML_Parser, start_handler: > &fn(tag: &str, attrs: &[@str]), end_handler: &fn(tag: &str)) { > let start_cb = |_user_data: *c_void, c_name: *c_char, _c_attrs: > **c_char| { > unsafe { > let name = str::raw::from_c_str(c_name); > start_handler(name, []); > } > }; > > let end_cb = |_user_data: *c_void, c_name: *c_char| { > unsafe { > let name = str::raw::from_c_str(c_name); > end_handler(name); > } > }; > > expat::XML_SetElementHandler(parser, start_cb, end_cb); > } > > This says that it saw &fn... instead of expected extern fn for the > second and third parameter. Any ideas how to do this? > > Thanks. > _______________________________________________ > Rust-dev mailing list > Rust-dev@mozilla.org > https://mail.mozilla.org/listinfo/rust-dev >
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