clean: make some classes abstract or interfaces

[nit.git] / lib / standard / stream.nit

diff --git a/lib/standard/stream.nit b/lib/standard/stream.nit
index 1a90d56..88a73ac 100644 (file)
--- a/lib/standard/stream.nit
+++ b/lib/standard/stream.nit
@@ -16,13 +16,13 @@ package stream
 import string
 
 # Abstract stream class
-class IOS
+interface IOS
        # close the stream
        fun close is abstract
 end
 
 # Abstract input streams
-class IStream
+interface IStream
        super IOS
        # Read a character. Return its ASCII value, -1 on EOF or timeout
        fun read_char: Int is abstract
@@ -81,7 +81,7 @@ class IStream
 end
 
 # Abstract output stream
-class OStream
+interface OStream
        super IOS
        # write a string
        fun write(s: String) is abstract
@@ -91,7 +91,7 @@ class OStream
 end
 
 # Input streams with a buffer
-class BufferedIStream
+abstract class BufferedIStream
        super IStream
        redef fun read_char
        do
@@ -203,14 +203,14 @@ class BufferedIStream
        end
 end
 
-class IOStream
+interface IOStream
        super IStream
        super OStream
 end
 
 ##############################################################"
 
-class FDStream
+abstract class FDStream
        super IOS
        # File description
        var _fd: Int