From 927c3e924cd894cb4b32efff666f949a294ab7c7 Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@gmail.com>
Date: Mon, 31 Oct 2016 19:37:21 -0700
Subject: Add a generic Ref type

---
 openssl/src/types.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 openssl/src/types.rs

(limited to 'openssl/src/types.rs')

diff --git a/openssl/src/types.rs b/openssl/src/types.rs
new file mode 100644
index 00000000..16829ea4
--- /dev/null
+++ b/openssl/src/types.rs
@@ -0,0 +1,27 @@
+use std::marker::PhantomData;
+
+use opaque::Opaque;
+
+pub unsafe trait OpenSslType {
+    type CType;
+
+    unsafe fn from_ptr(ptr: *mut Self::CType) -> Self;
+
+    fn as_ptr(&self) -> *mut Self::CType;
+}
+
+pub struct Ref<T>(Opaque, PhantomData<T>);
+
+impl<T: OpenSslType> Ref<T> {
+    pub unsafe fn from_ptr<'a>(ptr: *mut T::CType) -> &'a Ref<T> {
+        &*(ptr as *mut _)
+    }
+
+    pub unsafe fn from_ptr_mut<'a>(ptr: *mut T::CType) -> &'a mut Ref<T> {
+        &mut *(ptr as *mut _)
+    }
+
+    pub fn as_ptr(&self) -> *mut T::CType {
+        self as *const _ as *mut _
+    }
+}
-- 
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