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std::variant - cppreference.com
Feb 19, 2025 · As with unions, if a variant holds a value of some object type T, the T object is nested within the variant object. A variant is not permitted to hold references, arrays, or the …
std:: get (std::variant) - cppreference.com
Aug 22, 2024 · Otherwise, throws std::bad_variant_access. The call is ill-formed if I is not a valid index in the variant. 2) Type-based value accessor: If v holds the alternative T, returns a …
Standard library header <variant> (C++17) - cppreference.com
Dec 19, 2024 · variant_sizevariant_size_v (C++17) obtains the size of the variant 's list of alternatives at compile time (class template)(variable template) [edit] …
std::monostate - cppreference.com
Nov 24, 2024 · Unit type intended for use as a well-behaved empty alternative in std::variant. In particular, a variant of non-default-constructible types may list std::monostate as its first …
operator==, !=, <, <=, >, >=, <=> (std::variant) - cppreference.com
Jan 9, 2025 · Performs comparison operations on std::variant objects. 1-7) Compares two std::variant objects lhs and rhs. The contained values are compared (using the corresponding …
std::variant<Types...>::valueless_by_exception - cppreference.com
Feb 5, 2025 · Since variant is never permitted to allocate dynamic memory, the previous value cannot be retained and, therefore, restored in these situations. The "optional" cases can avoid …
std::variant<Types...>::variant - cppreference.com
Jun 25, 2024 · 1) Default constructor. Constructs a variant holding the value-initialized value of the first alternative (index () is zero). This constructor is constexpr if and only if the value …
std::visit - cppreference.com
Mar 1, 2025 · where indices is as-variant(values).index().... These overloads participate in overload resolution only if every type in VariantBases is a valid type.
std:: get_if (std::variant) - cppreference.com
Jun 25, 2024 · 1) Index-based non-throwing accessor: If pv is not a null pointer and pv->index()== I, returns a pointer to the value stored in the variant pointed to by pv. Otherwise, returns a null …
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Mar 30, 2025 · Planned Maintenance The site will be in a temporary read-only mode in the next few weeks to facilitate some long-overdue software updates. We apologize for any …