Merge rust-bitcoin#3855: io: Use get_ref / get_mut API

12a83e1 api: Run just check-api (Tobin C. Harding)
88dfd4e io: Use get_ref / get_mut API (Tobin C. Harding)
b7fdb35 io: Move constructors (Tobin C. Harding)

Pull request description:

  Currently in the `bridge` module to get a reference and mutable reference we provide the `as_inner` and `inner_mut` functions. These names are not in line with the `std::io` module which favours `get_ref` and `get_mut`.

  Add inherent functions `get_ref` and `get_mut` for accessing the wrapped value in `bridge::ToStd` and deprecate `as_inner` and `inner_mut`.

  To convince yourself this API is correct grep the stdlib `io` module for `fn get_ref` as opposed to `fn as_ref`.

  Patch 1 is a trivial code move cleanup.

  Close: rust-bitcoin#3832

ACKs for top commit:
  apoelstra:
    ACK 12a83e1; successfully ran local tests

Tree-SHA512: a5ebd806a4914aca050746ffca4930dc0a5bbeffd0d2fdb000af3bebd4d932cb08ec68acd18cd0a8a9cecf3cb7a211e066ebfd2fd62aaf40c5b4b5348e39e6d4

Author: apoelstra

api/io/all-features.txt

@@ -242,6 +242,8 @@ pub fn bitcoin_io::FromStd<T>::fill_buf(&mut self) -> bitcoin_io::Result<&[u8]>
 pub fn bitcoin_io::FromStd<T>::fill_buf(&mut self) -> std::io::error::Result<&[u8]>
 pub fn bitcoin_io::FromStd<T>::flush(&mut self) -> bitcoin_io::Result<()>
 pub fn bitcoin_io::FromStd<T>::flush(&mut self) -> std::io::error::Result<()>
+pub fn bitcoin_io::FromStd<T>::get_mut(&mut self) -> &mut T
+pub fn bitcoin_io::FromStd<T>::get_ref(&self) -> &T
 pub fn bitcoin_io::FromStd<T>::inner(&self) -> &T
 pub fn bitcoin_io::FromStd<T>::inner_mut(&mut self) -> &mut T
 pub fn bitcoin_io::FromStd<T>::into_inner(self) -> T

io/src/bridge.rs

@@ -12,18 +12,6 @@ impl<T> FromStd<T> {
     #[inline]
     pub const fn new(inner: T) -> Self { Self(inner) }
 
-    /// Returns the wrapped value.
-    #[inline]
-    pub fn into_inner(self) -> T { self.0 }
-
-    /// Returns a reference to the wrapped value.
-    #[inline]
-    pub fn inner(&self) -> &T { &self.0 }
-
-    /// Returns a mutable reference to the wrapped value.
-    #[inline]
-    pub fn inner_mut(&mut self) -> &mut T { &mut self.0 }
-
     /// Wraps a mutable reference to IO type.
     #[inline]
     pub fn new_mut(inner: &mut T) -> &mut Self {
@@ -38,6 +26,28 @@ impl<T> FromStd<T> {
         // SAFETY: the type is repr(transparent) and the pointer is created from Box
         unsafe { Box::from_raw(Box::into_raw(inner) as *mut Self) }
     }
+
+    /// Returns the wrapped value.
+    #[inline]
+    pub fn into_inner(self) -> T { self.0 }
+
+    /// Returns a reference to the wrapped value.
+    #[inline]
+    pub fn get_ref(&self) -> &T { &self.0 }
+
+    /// Returns a mutable reference to the wrapped value.
+    #[inline]
+    pub fn get_mut(&mut self) -> &mut T { &mut self.0 }
+
+    /// Returns a reference to the wrapped value.
+    #[inline]
+    #[deprecated(since = "TBD", note = "use `get_ref()` instead")]
+    pub fn inner(&self) -> &T { &self.0 }
+
+    /// Returns a mutable reference to the wrapped value.
+    #[inline]
+    #[deprecated(since = "TBD", note = "use `get_ref()` instead")]
+    pub fn inner_mut(&mut self) -> &mut T { &mut self.0 }
 }
 
 impl<T: std::io::Read> super::Read for FromStd<T> {