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Variants

std::indirect<T, Allocator>:: operator->, std::indirect<T, Allocator>:: operator*

From cppreference.net
Memory management library
( exposition only* )
Allocators
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Memory resources
Uninitialized storage (until C++20)
( until C++20* )
( until C++20* )
( until C++20* )

Garbage collector support (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
constexpr const_pointer operator - > ( ) const noexcept ;
(1) (自 C++26 起)
constexpr pointer operator - > ( ) noexcept ;
(2) (自 C++26 起)
constexpr const T & operator * ( ) const & noexcept ;
(3) (自 C++26 起)
constexpr T & operator * ( ) & noexcept ;
(4) (自 C++26 起)
constexpr const T && operator * ( ) const && noexcept ;
(5) (自 C++26 起)
constexpr T && operator * ( ) && noexcept ;
(6) (自 C++26 起)

访问被拥有的值。

1,2) 返回指向被拥有值的指针。
3-6) 返回被拥有值的引用。

如果 * this 不包含有效值,则行为未定义。

返回值

1,2) p
3,4) * p
5,6) std :: move ( * p  )

注释

此运算符不会检查 * this 是否处于无值状态,用户可通过手动调用 valueless_after_move() 来实现该检查。

示例