将vector声明为类数据成员时出错

Question

I am still wondering why an error message keeps on appearing when trying to declare a vector:

"Unknown type name 'setSize'"

#ifndef INTEGERSET_H
#define INTEGERSET_H

#include <vector>
using namespace std;

class IntegerSet
{
public:
    IntegerSet();
    IntegerSet(const int [], const int);
    IntegerSet & unionOfSets(const IntegerSet &, const IntegerSet &) const;
    IntegerSet & intersectionOfSets(const IntegerSet &, const IntegerSet &) const;
    void insertElement(int);
    void deleteElement(int);
    void printSet();
    bool isEqualTo(const IntegerSet &);

    const int setSize = 10;
    vector<bool> set(setSize);

};



#endif

PS : I had to add 4 spaces to every line in order to copy and paste the above code, because it all went out of format. Is there an easier way?

Answer 1

This is parsed as a function declaration:

vector<bool> set(setSize); // function `set`, argument type `setSize`

You need a different initialization syntax:

vector<bool> set = vector<bool>(setSize);

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Also note that giving things names such as set while using namespace std; is a very bad idea. using namespace std; is a bad idea in most cases anyway .