From 86c0368a04f8223faef64d236f5d3895f681a86e Mon Sep 17 00:00:00 2001
From: neingeist <neingeist@bl0rg.net>
Date: Mon, 14 Apr 2014 09:10:17 +0200
Subject: [PATCH] make some methods const

---
 accumulate.cpp | 2 +-
 classes.cpp    | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/accumulate.cpp b/accumulate.cpp
index 95062a2..f57cc2a 100644
--- a/accumulate.cpp
+++ b/accumulate.cpp
@@ -9,7 +9,7 @@
 int myfunction (int x, int y) { return x+2*y; }
 
 struct myclass {
-  int operator()(int x, int y) { return x+3*y; }
+  int operator()(int x, int y) const { return x+3*y; }
 } myobject;
 
 int main() {
diff --git a/classes.cpp b/classes.cpp
index 2e884fc..3da15b0 100644
--- a/classes.cpp
+++ b/classes.cpp
@@ -4,7 +4,7 @@
 class Animal {
   public:
     // Note: using *virtual* does the difference here!
-    virtual void makeSound() {
+    virtual void makeSound() const {
       std::cout << "<generic animal sound> from " << this << std::endl;
     }
 
@@ -18,14 +18,14 @@ class Animal {
 
 class Cow : public Animal {
   public:
-    void makeSound() {
+    void makeSound() const {
       std::cout << "Mooh. from " << this << std::endl;
     }
 };
 
 class Cat : public Animal {
   public:
-    void makeSound() {
+    void makeSound() const {
       std::cout << "Meow? from " << this << std::endl;
     }
 };