vector.h

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#ifndef VECTOR_H
#define VECTOR_H

#include<stdexcept>
using std::invalid_argument;
#include<iostream>
using std::ostream;

#ifndef DOXYGEN
template<class FUN>
class Vector;
#endif

template<class FUN>
ostream& operator<<(ostream& out, const Vector<FUN>& v);

template<class FUN>
class Vector
{
  public:
    Vector();

    Vector(const Vector<FUN>& v);

    ~Vector();

    void push_back(FUN v);

    FUN& operator[](const unsigned int idx);

    const FUN& operator[](const unsigned int idx) const;

    unsigned int length() const;

    unsigned int size() const;

#ifndef DOXYGEN
    /* Doxygen appears to have a couple bugs related to template classes and friend functions.
     * At this point, the best fix I see is to set
     * PREDEFINED = DOXYGEN
     * in your Doxyfile, then use #ifndef DOXYGEN / #endif to remove code that confuses Doxygen.
     *
     * Note that this function is documented at the top of the file and uses the \relatesalso
     * command so that it will be included on the Vector class docs page.
     */
    friend ostream& operator<< <FUN>(ostream& out, const Vector<FUN>& v);
#endif
  private:
    unsigned int sz;
    unsigned int max;
    FUN* array;
};

#include"vector.hpp"
#endif