constexpr any(); | (1) | (since C++17) |
any( const any& other ); | (2) | (since C++17) |
any( any&& other ); | (3) | (since C++17) |
template< class ValueType > any( ValueType&& value ); | (4) | (since C++17) |
template< class T, class... Args > explicit any( std::in_place_type_t<T>, Args&&... args ); | (5) | (since C++17) |
template< class T, class U, class... Args > explicit any( std::in_place_type_t<T>, std::initializer_list<U> il, Args&&... args ); | (6) | (since C++17) |
Constructs a new any
object.
other
into a new instance, so that any content is equivalent in both type and value to those of other
prior to the constructor call, or empty if other
is empty.std::decay_t<ValueType>
, direct-initialized from std::forward<ValueType>(value)
. If std::is_copy_constructible<std::decay_t<ValueType>>::value
is false
, the program is ill-formed. This overload only participates in overload resolution if std::decay_t<ValueType>
is not the same type as any
.T
, direct-non-list-initialized from std::forward<Args>(args)...
. If std::is_constructible_v<T, Args...>
is false
, the behavior is undefined.T
, direct-non-list-initialized from il, std::forward<Args>(args)...
. This overload only participates in overload resolution if std::is_constructible_v<T, std::initializer_list<U>&, Args...>
is true
. ValueType | - | contained value type |
Type requirements | ||
-
std::decay_t<ValueType> must meet the requirements of CopyConstructible . |
other | - | another any object to copy or move from |
value | - | value to initialize the contained value with |
il, args | - | arguments to be passed to the constructor of the contained object |
noexcept
specification: noexcept
Because the default constructor is constexpr
, static std::any
s are initialized as part of static non-local initialization, before any dynamic non-local initialization begins. This makes it safe to use an object of type std::any
in a constructor of any static object.
assigns an any object (public member function) |
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