Question

I have a function that currently accepts 2 vectors that can contain any plain old data …

template <class T>
void addData(const vector<T>& yData, vector<T> xData)
{ .. }

Question:

• Would it be possible to modify it to take two std::array or two std::vector, or even a combination thereof, given that these containers take a different number of template arguments?

Answer 1

Why not just use this, which works with any container using random-access iterators, including plain old arrays. If you can use iteration instead of indexing, you can do away with the random-access requirement as well.

template <typename Cnt1, typename Cnt2>
void addData(const Cnt1& yData, Cnt2 xData) // is pass-by-value intended?
{
    using std::begin;
    using std::end;
    typedef decltype(*begin(yData)) T;
    const auto sizeY = end(yData) - begin(yData);
    const auto sizeX = end(xData) - begin(xData);
    // ...
}

C++03 version (doesn’t support plain old arrays):

template <typename Cnt1, typename Cnt2>
void addData(const Cnt1& yData, Cnt2 xData) // is pass-by-value intended?
{
    typedef Cnt1::value_type T;
    const size_t sizeY = yData.end() - yData.begin();
    const size_t sizeX = xData.end() - xData.begin();
    // ...
}