test, C++ (clang) - rextester

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#include <iostream>

template<typename T, size_t N>
struct SVectorN
{
    private:
        T components[N];
    
    public:
        SVectorN(const T(&another)[N])
        {
            std::copy(std::begin(another), std::end(another), components);
        }
    
        SVectorN(std::initializer_list<T> &&init_)
        {
            std::copy(std::begin(init_), std::end(init_), components);
        }
    
        template< typename ... U>
        SVectorN(U ...val_)
        {
            T tmp[] = { val_ ... };
            std::copy(std::begin(tmp), std::end(tmp), components);
        }
    
        void print() const
        {
            for (auto &&c : components)
                std::cout<< c <<",";
            std::cout<<std::endl;
        }
};

int main()
{
    double input[4] = { 0.1, 0.2, 0.3, 0.4 };
    
    SVectorN<double, 4> t(input);
    t.print();
    
    SVectorN<double, 4> c = { 1.3, 1.4, 1.5, 1.6 };
    c.print();
    
    SVectorN<double, 4> d(1.3, 1.4, 1.5, 1.6 );
    d.print();
}

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Compilation time: 0.62 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,85 sec