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c++arraysinitializationconcatenation

C++ initialize array with another array and new values

I'm coming to C++ from python and would like to do the equivalent of this with arrays if possible:

both = [...]
a = [a1, a2] + both
[a1, a2, ...]
b = [b1, b2] + both
[b1, b2, ...]
Solution

  • To do such a thing with arrays you might consider the following code

        #include <iostream>
    
    int main()
    {
        int both[] ={1, 2, 3};
        std::cout << sizeof(both)/sizeof(*both);
        int a[sizeof(both)/sizeof(*both) + 2] = {4, 4};
        int b[sizeof(both)/sizeof(*both) + 2] = {5, 5};
        for (int i = 0; i < sizeof(both)/sizeof(*both); ++i)
        {
            a[2+i] = both[i];
            b[2+i] = both[i];
        }
    
        return 0;
    }

    But since you are using c++, not c, you might really consider using one of the containers offered by c++ standard library