Merge pull request #45 from TheBlueMatt/main

[ldk-c-bindings] / lightning-c-bindings / src / c_types / mod.rs

diff --git a/lightning-c-bindings/src/c_types/mod.rs b/lightning-c-bindings/src/c_types/mod.rs
index 5db6dda00b908375df6a5b02accae57d2f21a89a..274981da8e02a22c3a7dc24e7e61aba72ea9e5f5 100644 (file)
--- a/lightning-c-bindings/src/c_types/mod.rs
+++ b/lightning-c-bindings/src/c_types/mod.rs
@@ -17,6 +17,16 @@ use std::convert::TryInto; // Bindings need at least rustc 1.34
 
 use std::io::{Cursor, Read}; // TODO: We should use core2 here when we support no_std
 
+#[repr(C)]
+/// A dummy struct of which an instance must never exist.
+/// This corresponds to the Rust type `Infallible`, or, in unstable rust, `!`
+pub struct NotConstructable {
+       _priv_thing: core::convert::Infallible,
+}
+impl From<core::convert::Infallible> for NotConstructable {
+       fn from(_: core::convert::Infallible) -> Self { unreachable!(); }
+}
+
 /// Integer in the range `0..32`
 #[derive(PartialEq, Eq, Copy, Clone)]
 #[allow(non_camel_case_types)]
@@ -425,7 +435,6 @@ pub(crate) fn deserialize_obj_arg<A, I: lightning::util::ser::ReadableArgs<A>>(s
 }
 
 #[repr(C)]
-#[derive(Clone)]
 /// A Rust str object, ie a reference to a UTF8-valid string.
 /// This is *not* null-terminated so cannot be used directly as a C string!
 pub struct Str {
@@ -469,6 +478,11 @@ impl Into<Str> for String {
                Str { chars: s.as_ptr(), len: s.len(), chars_is_owned: true }
        }
 }
+impl Clone for Str {
+       fn clone(&self) -> Self {
+               self.into_str().clone().into()
+       }
+}
 
 impl Drop for Str {
        fn drop(&mut self) {