CODEWITHSUNDEEP
c++arraysobject
Xavier Hubbard Anderson
Xavier Hubbard Anderson

Reputation: 162

creating an large array of objects c++

I need to create a large array(1000) of histograms where each histogram is slightly different. I am new to C++ and my first thought on how to do this was using a for loop which will create the histogram and add it to the array in the loop, but ive run into the issue of variable names (which i expected). How can i make the variable name of each histogram different while adding them in the loop?

sorry if that was poorly worded.

Upvotes: 1

Views: 488

Answers (1)

jxh
jxh

Reputation: 70422

It sounds like what you want is a histogram class where each instance is a little different.

class Histogram {
    unsigned m_count;
    std::string m_label;
public:
    Histogram(std::string label) : m_count(0), m_label(label) {}
    std::string & label () { return m_label; }
    std::string label () const { return m_label; }
    unsigned & count () { return m_count; }
    unsigned count () const { return m_count; }
};

It might be easier to manage these within a map rather than a vector (unless you can actually classify the input into a number), but each histogram will need a unique label.

std::map<std::string, std::unique_ptr<Histogram> > histograms;

while (more_input()) {
    input = get_input();
    std::string classification = classify_input(input);
    if (histograms[classification] == 0)
        histograms[classification]
            = std::unique_ptr<Histogram>(new Histogram(classification));
    histograms[classification]->count() += 1;
}

Upvotes: 4

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