Question

I am trying to create a structure of double vectors in C++.

struct distance{
    vector<double> x(10000);
    vector<double> y(10000);
    vector<double> z(10000);
};

distance distance_old, distance_new;

In the definition it throws an error saying:

error: expected identifier before numeric constant
error: expected ‘,’ or ‘...’ before numeric constant 

Where am I going wrong?

I saw this post Structure of vectors C++
but it doesn’t seem to be working for me.

Answer 1

You are trying to construct the vectors in the structure, which can’t be done. You have to do it in a constructor just like a normal class:

struct distance
{

    vector<double> x;
    vector<double> y;
    vector<double> z;

    distance()
        : x(10000), y(10000), z(10000)
        { }
};