#include <utility>

template <typename T, typename U>
T RandomChoice_Recursive(unsigned choice, unsigned i, U a)
{
    return a;
}

template <typename T, typename U, typename... TArgs>
T RandomChoice_Recursive(unsigned choice, unsigned i, U a, TArgs... tail)
{
    if (i == choice)
        return a;
    else
        return RandomChoice_Recursive<T>(choice, i+1, std::forward<TArgs>(tail)...);
}

template <typename T, typename... TArgs>
T RandomChoice(T a, TArgs... tail)
{
    unsigned num = sizeof...(TArgs) + 1;
    unsigned choice = rand();
    choice %= num;
    return RandomChoice_Recursive<T>(choice, 0, std::forward<T>(a), std::forward<TArgs>(tail)...);
}

template <typename T, typename U, typename... UArgs>
T RandomChoiceNew_Recursive(unsigned choice, unsigned i, UArgs... args)
{
    return new U(args...);
}

template <typename T, typename U, typename V, typename... TArgs, typename... UArgs>
T RandomChoiceNew_Recursive(unsigned choice, unsigned i, UArgs... args)
{
    if (i == choice)
        return new U(args...);
    else
        return RandomChoiceNew_Recursive<T, V, TArgs...>(choice, i+1, std::forward<UArgs>(args)...);
}

template <typename T, typename... TArgs, typename... UArgs>
T RandomChoiceNew(UArgs... args)
{
    unsigned num = sizeof...(TArgs) + 1;
    unsigned choice = rand();
    choice %= num;
    return RandomChoiceNew_Recursive<T, TArgs...>(choice, 0, std::forward<UArgs>(args)...);
}