Support Option<()> (and &Option<()>) incl conversion and printing

[ldk-c-bindings] / c-bindings-gen / src / blocks.rs

diff --git a/c-bindings-gen/src/blocks.rs b/c-bindings-gen/src/blocks.rs
index 6e6b897e9c13ce9cd9b21fdda30cbbbf28870a39..b2f952be5fa1cb3fdcb6f51a6d677d7680f59d60 100644 (file)
--- a/c-bindings-gen/src/blocks.rs
+++ b/c-bindings-gen/src/blocks.rs
@@ -346,27 +346,38 @@ pub fn write_option_block<W: std::io::Write>(w: &mut W, mangled_container: &str,
        writeln!(w, "/// An enum which can either contain a {} or not", inner_type).unwrap();
        writeln!(w, "pub enum {} {{", mangled_container).unwrap();
        writeln!(w, "\t/// When we're in this state, this {} contains a {}", mangled_container, inner_type).unwrap();
-       writeln!(w, "\tSome({}),", inner_type).unwrap();
+       if inner_type != "" {
+               writeln!(w, "\tSome({}),", inner_type).unwrap();
+       } else {
+               writeln!(w, "\tSome,").unwrap();
+       }
        writeln!(w, "\t/// When we're in this state, this {} contains nothing", mangled_container).unwrap();
        writeln!(w, "\tNone").unwrap();
        writeln!(w, "}}").unwrap();
 
        writeln!(w, "impl {} {{", mangled_container).unwrap();
        writeln!(w, "\t#[allow(unused)] pub(crate) fn is_some(&self) -> bool {{").unwrap();
-       writeln!(w, "\t\tif let Self::Some(_) = self {{ true }} else {{ false }}").unwrap();
+       writeln!(w, "\t\tif let Self::None = self {{ false }} else {{ true }}").unwrap();
        writeln!(w, "\t}}").unwrap();
        writeln!(w, "\t#[allow(unused)] pub(crate) fn is_none(&self) -> bool {{").unwrap();
        writeln!(w, "\t\t!self.is_some()").unwrap();
        writeln!(w, "\t}}").unwrap();
-       writeln!(w, "\t#[allow(unused)] pub(crate) fn take(mut self) -> {} {{", inner_type).unwrap();
-       writeln!(w, "\t\tif let Self::Some(v) = self {{ v }} else {{ unreachable!() }}").unwrap();
-       writeln!(w, "\t}}").unwrap();
+       if inner_type != "" {
+               writeln!(w, "\t#[allow(unused)] pub(crate) fn take(mut self) -> {} {{", inner_type).unwrap();
+               writeln!(w, "\t\tif let Self::Some(v) = self {{ v }} else {{ unreachable!() }}").unwrap();
+               writeln!(w, "\t}}").unwrap();
+       }
        writeln!(w, "}}").unwrap();
 
        writeln!(w, "#[no_mangle]").unwrap();
        writeln!(w, "/// Constructs a new {} containing a {}", mangled_container, inner_type).unwrap();
-       writeln!(w, "pub extern \"C\" fn {}_some(o: {}) -> {} {{", mangled_container, inner_type, mangled_container).unwrap();
-       writeln!(w, "\t{}::Some(o)", mangled_container).unwrap();
+       if inner_type != "" {
+               writeln!(w, "pub extern \"C\" fn {}_some(o: {}) -> {} {{", mangled_container, inner_type, mangled_container).unwrap();
+               writeln!(w, "\t{}::Some(o)", mangled_container).unwrap();
+       } else {
+               writeln!(w, "pub extern \"C\" fn {}_some() -> {} {{", mangled_container, mangled_container).unwrap();
+               writeln!(w, "\t{}::Some", mangled_container).unwrap();
+       }
        writeln!(w, "}}").unwrap();
 
        writeln!(w, "#[no_mangle]").unwrap();