Resize two dimensional vector in a class

Question

I'm trying to resize a vector in the class. I don't know where is the error. Hope you can help me.

This is my code:

class State {
private:
    vector<int> numbers;
    int score;

public:
    int getScore() {
        return score;
    }
    void setScore(int score) {
        this->score = score;
    }
    int getSize () {
        return this->numbers.size();
    }
    void setSize(int size) {
        this->numbers.clear();
        this->numbers.resize(size);
        for (int i = 0; i < size; ++i)
            this->numbers[i].resize(size);
    }
};

When I try to compile, I get this error:

In file included from ./power.cpp:11:
./power.hpp:45:24: error: member reference base type 'value_type' (aka 'int') is not a structure or union
                    this->numbers[i].resize(size);
                    ~~~~~~~~~~~~~~~~^~~~~~~
1 error generated.

Hope you can help me.

Thanks in advance :)

Welcome to SO! please add your main() routine to make it a Minimal, Complete, and Verifiable example. Btw - your vector<int> is technically not "two-dimensional" , thus you try to resize a plain int luring at numbers[i]. — decltype_auto
– decltype_auto, Commented Nov 11, 2015 at 17:43

vsoftco · Accepted Answer · 2015-11-11 17:42:49Z

1

vector<int> numbers;

declares a one-dimensional vector. In the line

this->numbers[i].resize(size);

you assume that numbers[i] is itself a vector, which is not the case (it is an int). What you probably want is to declare

vector<vector<int>> numbers;

or "simulate" the 2D vector as a 1D flatten vector (in general faster) but making sure to map from 2D to 1D and vice versa.

answered Nov 11, 2015 at 17:42

vsoftco

56.9k12 gold badges150 silver badges269 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

decltype_auto Over a year ago

For mentioning "simulate" [..] as 1D vector ++vote: That vector<vector<....>>> contortionism is a pain in the eye.

elena.bdc Over a year ago

Yeah, that's it. Thanks for your help :)

Collectives™ on Stack Overflow

Resize two dimensional vector in a class

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related