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c++tuplesmetaprogrammingvariadic-templates

constructing tuple of classes type from template argument types

I would like to construct a type which is a tuple of same class with different template argument types. I mean:

Imagine we have a class

template<class Arg>
class A
{
    //.... details
}

I want to define something like:

template<class... Args>
struct construct_tuple 
{
    //assume I can access Args[...]
    using type = std::tuple<A<Args[0]>, A<Args[1]>, ..., A<Args[n]>>;
}

Could you please help?

I believe there might be a solution by iterating over the variadic arguments and using conctenation between tuple types or maybe using some other TMP e.g. std::enable_if or std::conditional_t.

Solution

  • While your code doesn't try to construct anything, this will compile and provide what you want.

    template<class... Args>
struct construct_tuple 
{
    //assume I can access Args[...]
    using type = std::tuple<A<Args>...>;
};