openpgp-ffi: Derive conversion functions.

  - This is a framework for dealing with ownership and references at
    the FFI boundary.  Previously, we used macros to do that.  This
    change introduces a more idiomatic interface, we use traits
    converting from raw pointers of a wrapper type to objects,
    references, or mutable references to a wrapped type.

  - For now, we use the wrapped type as wrapper type.  We merely
    introduce a new mechanism replacing the macro-based one.

  - This patch also converts all the derived functions.

  - The following patches will convert all the functions that are
    already using the ffi_wrapper_type.  Once this conversion is done,
    we can introduce our own wrapper type.

1 files changed, 6 insertions, 0 deletions

diff --git a/ffi/src/lib.rs b/ffi/src/lib.rs
index f183f9cc..9b095cd3 100644
--- a/ffi/src/lib.rs
+++ b/ffi/src/lib.rs
@@ -131,6 +131,12 @@ pub mod openpgp {
 pub(crate) use openpgp::{
     build_hasher,
     strndup,
+    MoveFromRaw,
+    RefRaw,
+    RefMutRaw,
+    MoveIntoRaw,
+    MoveResultIntoRaw,
+    Maybe,
 };
 
 /* Error handling with implicit context.  */