From ecbb896b9eb2acadefde57be493e4298c1aa04a3 Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@gmail.com>
Date: Sun, 14 May 2017 21:29:18 -0400
Subject: Add `Read::initializer`.

This is an API that allows types to indicate that they can be passed
buffers of uninitialized memory which can improve performance.
---
 src/libstd/io/impls.rs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'src/libstd/io/impls.rs')

diff --git a/src/libstd/io/impls.rs b/src/libstd/io/impls.rs
index f691289811b..d6b41ceda43 100644
--- a/src/libstd/io/impls.rs
+++ b/src/libstd/io/impls.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 use cmp;
-use io::{self, SeekFrom, Read, Write, Seek, BufRead, Error, ErrorKind};
+use io::{self, SeekFrom, Read, Initializer, Write, Seek, BufRead, Error, ErrorKind};
 use fmt;
 use mem;
 
@@ -23,6 +23,11 @@ impl<'a, R: Read + ?Sized> Read for &'a mut R {
         (**self).read(buf)
     }
 
+    #[inline]
+    unsafe fn initializer(&self) -> Initializer {
+        (**self).initializer()
+    }
+
     #[inline]
     fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
         (**self).read_to_end(buf)
@@ -87,6 +92,11 @@ impl<R: Read + ?Sized> Read for Box<R> {
         (**self).read(buf)
     }
 
+    #[inline]
+    unsafe fn initializer(&self) -> Initializer {
+        (**self).initializer()
+    }
+
     #[inline]
     fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
         (**self).read_to_end(buf)
@@ -171,6 +181,11 @@ impl<'a> Read for &'a [u8] {
         Ok(amt)
     }
 
+    #[inline]
+    unsafe fn initializer(&self) -> Initializer {
+        Initializer::nop()
+    }
+
     #[inline]
     fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
         if buf.len() > self.len() {
-- 
cgit 1.4.1-3-g733a5