+/// Writes out a C-callable concrete Vec<A> struct and utility methods
+pub fn write_vec_block<W: std::io::Write>(w: &mut W, mangled_container: &str, inner_type: &str, clonable: bool) {
+ writeln!(w, "#[repr(C)]").unwrap();
+ writeln!(w, "pub struct {} {{", mangled_container).unwrap();
+ writeln!(w, "\tpub data: *mut {},", inner_type).unwrap();
+ writeln!(w, "\tpub datalen: usize").unwrap();
+ writeln!(w, "}}").unwrap();
+
+ writeln!(w, "impl {} {{", mangled_container).unwrap();
+ writeln!(w, "\t#[allow(unused)] pub(crate) fn into_rust(&mut self) -> Vec<{}> {{", inner_type).unwrap();
+ writeln!(w, "\t\tif self.datalen == 0 {{ return Vec::new(); }}").unwrap();
+ writeln!(w, "\t\tlet ret = unsafe {{ Box::from_raw(std::slice::from_raw_parts_mut(self.data, self.datalen)) }}.into();").unwrap();
+ writeln!(w, "\t\tself.data = std::ptr::null_mut();").unwrap();
+ writeln!(w, "\t\tself.datalen = 0;").unwrap();
+ writeln!(w, "\t\tret").unwrap();
+ writeln!(w, "\t}}").unwrap();
+ writeln!(w, "\t#[allow(unused)] pub(crate) fn as_slice(&self) -> &[{}] {{", inner_type).unwrap();
+ writeln!(w, "\t\tunsafe {{ std::slice::from_raw_parts_mut(self.data, self.datalen) }}").unwrap();
+ writeln!(w, "\t}}").unwrap();
+ writeln!(w, "}}").unwrap();
+
+ writeln!(w, "impl From<Vec<{}>> for {} {{", inner_type, mangled_container).unwrap();
+ writeln!(w, "\tfn from(v: Vec<{}>) -> Self {{", inner_type).unwrap();
+ writeln!(w, "\t\tlet datalen = v.len();").unwrap();
+ writeln!(w, "\t\tlet data = Box::into_raw(v.into_boxed_slice());").unwrap();
+ writeln!(w, "\t\tSelf {{ datalen, data: unsafe {{ (*data).as_mut_ptr() }} }}").unwrap();
+ writeln!(w, "\t}}").unwrap();
+ writeln!(w, "}}").unwrap();
+
+ writeln!(w, "#[no_mangle]").unwrap();
+ writeln!(w, "pub extern \"C\" fn {}_free(_res: {}) {{ }}", mangled_container, mangled_container).unwrap();
+ writeln!(w, "impl Drop for {} {{", mangled_container).unwrap();
+ writeln!(w, "\tfn drop(&mut self) {{").unwrap();
+ writeln!(w, "\t\tif self.datalen == 0 {{ return; }}").unwrap();
+ writeln!(w, "\t\tunsafe {{ Box::from_raw(std::slice::from_raw_parts_mut(self.data, self.datalen)) }};").unwrap();
+ writeln!(w, "\t}}").unwrap();
+ writeln!(w, "}}").unwrap();
+ if clonable {
+ writeln!(w, "impl Clone for {} {{", mangled_container).unwrap();
+ writeln!(w, "\tfn clone(&self) -> Self {{").unwrap();
+ writeln!(w, "\t\tlet mut res = Vec::new();").unwrap();
+ writeln!(w, "\t\tif self.datalen == 0 {{ return Self::from(res); }}").unwrap();
+ writeln!(w, "\t\tres.extend_from_slice(unsafe {{ std::slice::from_raw_parts_mut(self.data, self.datalen) }});").unwrap();
+ writeln!(w, "\t\tSelf::from(res)").unwrap();
+ writeln!(w, "\t}}").unwrap();
+ writeln!(w, "}}").unwrap();
+ }
+}
+
+/// Writes out a C-callable concrete (A, B, ...) struct and utility methods
+pub fn write_tuple_block<W: std::io::Write>(w: &mut W, mangled_container: &str, types: &[String], clonable: bool) {
+ writeln!(w, "#[repr(C)]").unwrap();
+ writeln!(w, "pub struct {} {{", mangled_container).unwrap();
+ for (idx, ty) in types.iter().enumerate() {
+ writeln!(w, "\tpub {}: {},", ('a' as u8 + idx as u8) as char, ty).unwrap();
+ }
+ writeln!(w, "}}").unwrap();
+
+ let mut tuple_str = "(".to_owned();
+ for (idx, ty) in types.iter().enumerate() {
+ if idx != 0 { tuple_str += ", "; }
+ tuple_str += ty;
+ }
+ tuple_str += ")";
+
+ writeln!(w, "impl From<{}> for {} {{", tuple_str, mangled_container).unwrap();
+ writeln!(w, "\tfn from (tup: {}) -> Self {{", tuple_str).unwrap();
+ writeln!(w, "\t\tSelf {{").unwrap();
+ for idx in 0..types.len() {
+ writeln!(w, "\t\t\t{}: tup.{},", ('a' as u8 + idx as u8) as char, idx).unwrap();
+ }
+ writeln!(w, "\t\t}}").unwrap();
+ writeln!(w, "\t}}").unwrap();
+ writeln!(w, "}}").unwrap();
+ writeln!(w, "impl {} {{", mangled_container).unwrap();
+ writeln!(w, "\t#[allow(unused)] pub(crate) fn to_rust(mut self) -> {} {{", tuple_str).unwrap();
+ write!(w, "\t\t(").unwrap();
+ for idx in 0..types.len() {
+ write!(w, "{}self.{}", if idx != 0 {", "} else {""}, ('a' as u8 + idx as u8) as char).unwrap();
+ }
+ writeln!(w, ")").unwrap();
+ writeln!(w, "\t}}").unwrap();
+ writeln!(w, "}}").unwrap();
+
+ if clonable {
+ writeln!(w, "impl Clone for {} {{", mangled_container).unwrap();
+ writeln!(w, "\tfn clone(&self) -> Self {{").unwrap();
+ writeln!(w, "\t\tSelf {{").unwrap();
+ for idx in 0..types.len() {
+ writeln!(w, "\t\t\t{}: self.{}.clone(),", ('a' as u8 + idx as u8) as char, ('a' as u8 + idx as u8) as char).unwrap();
+ }
+ writeln!(w, "\t\t}}").unwrap();
+ writeln!(w, "\t}}").unwrap();
+ writeln!(w, "}}").unwrap();
+ writeln!(w, "#[no_mangle]").unwrap();
+ writeln!(w, "pub extern \"C\" fn {}_clone(orig: &{}) -> {} {{ orig.clone() }}", mangled_container, mangled_container, mangled_container).unwrap();
+ }
+
+ write!(w, "#[no_mangle]\npub extern \"C\" fn {}_new(", mangled_container).unwrap();
+ for (idx, gen) in types.iter().enumerate() {
+ write!(w, "{}{}: ", if idx != 0 { ", " } else { "" }, ('a' as u8 + idx as u8) as char).unwrap();
+ //if !self.write_c_type_intern(&mut created_container, gen, generics, false, false, false) { return false; }
+ write!(w, "{}", gen).unwrap();
+ }
+ writeln!(w, ") -> {} {{", mangled_container).unwrap();
+ write!(w, "\t{} {{ ", mangled_container).unwrap();
+ for idx in 0..types.len() {
+ write!(w, "{}, ", ('a' as u8 + idx as u8) as char).unwrap();
+ }
+ writeln!(w, "}}\n}}\n").unwrap();
+
+ writeln!(w, "#[no_mangle]").unwrap();
+ writeln!(w, "pub extern \"C\" fn {}_free(_res: {}) {{ }}", mangled_container, mangled_container).unwrap();
+}
+