CODEWITHSUNDEEP
c++c++11
7cows
7cows

Reputation: 5034

Creating this function template

I have a simple class template with tuples of vectors:

template <typename... T>
struct TupleOfVectors {
  std::tuple<std::vector<T>...> tuple;
};

I can use it like this:

TupleOfVectors<double, std::string> tuple;

auto vec0 = std::get<0>(tuple.tuple);
vec0.push_back(1.2);

auto vec1 = std::get<1>(tuple.tuple);
vec1.push_back("foo");

I want to encapsulate this into the class template itself. This is how I'd really like to use my class template:

tuple.vec<0>.push_back(1.2);
tuple.vec<1>.push_back("foo");

How do I develop such a vec() template member function?

Upvotes: 2

Views: 142

Answers (1)

yngccc
yngccc

Reputation: 5684

template <typename... Ts>
struct TupleOfVectors {
    std::tuple<std::vector<Ts>...> tuple;

    template< size_t N >
    auto vec() -> decltype( std::get<N>(tuple) ) {
        return std::get<N>(tuple);
    }

};

TupleOfVectors<int, short, double, float> t;

t.vec<3>().push_back( 3.14f );

Upvotes: 10

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