Initialize class object like an array

Question

I'm creating a custom vector class for a school project and I'd like to be able to initialize it like this:

vector x = { 2, 3, 4, 5 };

Is there any way to do this is C++?

Here is the header of my class:

class vector {
private:

    int vsize;
    int valloc;
    double* values;

public:

    vector() : vsize(0), valloc(0), values(nullptr) {}
    vector(???);
    vector(const vector& v);
    int size() const { return vsize; };
    int alloc() const { return valloc; };
    void resize(int newsize);
    void insert(double x);
    void insert(double x, int index);
    double* value() const { return values; };
    double value(int index) const { return *(values + index - 1); }

};

Use std::initializer_list.

rafix07
– rafix07

2019-10-25 19:00:40 +00:00
Commented Oct 25, 2019 at 19:00 — rafix07
– rafix07, Commented Oct 25, 2019 at 19:00

R Sahu · Accepted Answer · 2019-10-25 19:03:22Z

3

You can support that by adding a constructor that takes a std::initialzer_list<double>.

vector(std::initializer_list<double> init) : vsize(init.size()),
                                             valloc(init.size()),
                                             values(new double[init.size()])
{
   std::copy(init.begin(), init.end(), values);
}

You can make that a bit more flexible by using a template.

template <typename T>
vector(std::initializer_list<T> init) : vsize(init.size()),
                                        valloc(init.size()),
                                        values(new double[init.size()])
{
   std::copy(init.begin(), init.end(), values);
}

answered Oct 25, 2019 at 19:03

R Sahu

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