constexpr bool valueless_by_exception() const noexcept;
Effects: Returns false if and only if the variant holds a value.
[ Note: A variant might not hold a value if an exception is thrown during a type-changing assignment or emplacement. The latter means that even a variant<float, int> can become valueless_by_exception(), for instance by
struct S { operator int() { throw 42; }};
variant<float, int> v{12.f};
v.emplace<1>(S());
— end note ]
constexpr size_t index() const noexcept;
Effects: If valueless_by_exception() is true, returns variant_npos. Otherwise, returns the zero-based index of the alternative of the contained value.
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