int v1;

double v2;

public:

Foo(int n) : v1(n), v2() {}

Foo(int n, double f) noexcept : v1(n), v2(f) {}

std::cout << "Foo is ...\n" << std::boolalpha

<< "\tTrivially-constructible from const Foo&? "

<< std::is_trivially_constructible<Foo, const Foo&>::value << '\n'

<< "\tTrivially-constructible from int? "

<< std::is_trivially_constructible<Foo, int>::value << '\n'

<< "\tConstructible from int? "

<< std::is_constructible<Foo, int>::value << '\n'

<< "\tNothrow-constructible from int? "

<< std::is_nothrow_constructible<Foo, int>::value << '\n'

<< "\tNothrow-constructible from int and double? "

<< std::is_nothrow_constructible<Foo, int, double>::value << '\n';