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std:: indirectly_copyable

From cppreference.net
C++
Iterator library
Iterator concepts
Iterator primitives
Algorithm concepts and utilities
Indirect callable concepts
Common algorithm requirements
(C++20)
(C++20)
indirectly_copyable
(C++20)
(C++20)
(C++20)
(C++20)
Utilities
(C++20)
Iterator adaptors
Range access
(C++11) (C++14)
(C++14) (C++14)
(C++11) (C++14)
(C++14) (C++14)
(C++17) (C++20)
(C++17)
(C++17)
定义于头文件 <iterator>
template < class In, class Out >

concept indirectly_copyable =
std:: indirectly_readable < In > &&

std:: indirectly_writable < Out, std:: iter_reference_t < In >> ;
(C++20 起)

indirectly_copyable 概念规定了 indirectly_readable 类型与 indirectly_writable 类型之间的关系。 indirectly_writable 类型必须能够直接复制 indirectly_readable 类型所引用的对象。

参见

(C++20)
规定值可以从 indirectly_readable 类型移动至 indirectly_writable 类型
(概念)
(C++20)
规定值可以从 indirectly_readable 类型复制至 indirectly_writable 类型，且可通过中间对象执行复制操作
(概念)