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Made virtual int _id() function return a const #1

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Made virtual int _id() function return a const #1

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2 changes: 1 addition & 1 deletion src/main/cpp/algorithms/datastructures/stack/Stack.h
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,7 @@ class Stack
virtual ~Stack() {}

// return the ID the stack implementation
virtual int id() { return id_; }
virtual int id() const { return id_; }

// return the number of elements in the stack
virtual int size() = 0;
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