move TeeReader to lib

Author: yuk1ty

Diff for: chapter3/src/3_7/tee_reader.rs

@@ -1,35 +1,5 @@
-use std::io::{Read, Write};
-
-struct TeeReader<R, W>
-where
-    R: Read,
-    W: Write,
-{
-    reader: R,
-    writer: W,
-}
-
-impl<R, W> TeeReader<R, W>
-where
-    R: Read,
-    W: Write,
-{
-    fn new(reader: R, writer: W) -> Self {
-        Self { reader, writer }
-    }
-}
-
-impl<R, W> Read for TeeReader<R, W>
-where
-    R: Read,
-    W: Write,
-{
-    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
-        let n = self.reader.read(buf)?;
-        self.writer.write_all(&buf[..n])?;
-        Ok(n)
-    }
-}
+use lib::io::TeeReader;
+use std::io::Read;
 
 fn main() -> std::io::Result<()> {
     // TeeReader を使用した場合の例。

Diff for: lib/src/io.rs

@@ -1,5 +1,7 @@
 mod multi_reader;
 mod multi_writer;
+mod tee_reader;
 
 pub use multi_reader::MultiReader;
 pub use multi_writer::MultiWriter;
+pub use tee_reader::TeeReader;

Diff for: lib/src/io/tee_reader.rs

@@ -0,0 +1,32 @@
+use std::io::{Read, Write};
+
+pub struct TeeReader<R, W>
+where
+    R: Read,
+    W: Write,
+{
+    reader: R,
+    writer: W,
+}
+
+impl<R, W> TeeReader<R, W>
+where
+    R: Read,
+    W: Write,
+{
+    pub fn new(reader: R, writer: W) -> Self {
+        Self { reader, writer }
+    }
+}
+
+impl<R, W> Read for TeeReader<R, W>
+where
+    R: Read,
+    W: Write,
+{
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        let n = self.reader.read(buf)?;
+        self.writer.write_all(&buf[..n])?;
+        Ok(n)
+    }
+}