How to access the elements of arrays in a vector in C++?

Question

I'm trying to find a way in C++ to have a dynamic size array (vector) in which I can store arrays of strings. This concept shall be used to store data with different labels, e.g.:

{"Car", "0", "0", "400"},
{"Person", "0", "1", "320"},
{"Bicycle", "1", "0", "300"},
...

After a bit internet search, I came this far:

struct Stringvec {std::string element[4];};
std::vector<Stringvec> list;
list.push_back({"Car", "0", "0", "400"});

But I cannot figure out how to access the individual elements of the arrays I store in the vector, e.g. "Car". This won't work:

std::string label = list[0][0]; //Gives error:
error: no match for 'operator[]' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<Stringvec> >::value_type {aka Stringvec}' and 'int')

Anyone knows how to get around this or an even better way to store string arrays in dynamic size arrays?

Answer 1

You can try using std::array within std::vector

vector<array<string, 4>> list = {
    {"Car", "0", "0", "400"},
    {"Bicycle", "1", "2", "500"}
};

Then you can access the elements you want to access just like you want:

string str = list[0][1];