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I.25: Marked center and draw as const.
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@@ -1726,8 +1726,8 @@ You just knew that `Shape` would turn up somewhere :-)
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class Shape { // bad: interface class loaded with data
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class Shape { // bad: interface class loaded with data
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public:
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public:
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Point center() { return c; }
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Point center() const { return c; }
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virtual void draw();
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virtual void draw() const;
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virtual void rotate(int);
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virtual void rotate(int);
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// ...
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// ...
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private:
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private:
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@@ -1740,8 +1740,8 @@ This will force every derived class to compute a center -- even if that's non-tr
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class Shape { // better: Shape is a pure interface
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class Shape { // better: Shape is a pure interface
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public:
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public:
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virtual Point center() = 0; // pure virtual function
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virtual Point center() const = 0; // pure virtual function
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virtual void draw() = 0;
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virtual void draw() const = 0;
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virtual void rotate(int) = 0;
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virtual void rotate(int) = 0;
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// ...
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// ...
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// ... no data members ...
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// ... no data members ...
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