Is there a way to slice the structure vector in c++?

I have an data named faces which definition is like this:

struct ivec3 {
    unsigned int v0;
    unsigned int v1;
    unsigned int v2;
};

std::vector<ivec3> faces;

I got the faces with 100 elements(faces.size()=100).
Now I want to get all v0 of faces. If I use the Python, I can do it like this

all_v0 = faces[:, 0]

So, how can I use the slicing operation in C++ like above code of Python?

Thanks very much!

>Solution :

You can do this with the help of std::transform:

std::vector<int> all_v0;
all_v0.reserve(faces.size());
std::transform(faces.begin(), faces.end(), 
               std::back_inserter(all_v0), 
               [] (const ivec3& i) { return i.v0; });