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ä½ç½®ï¼šé¦–页 > C++ å‚考手册 >范围库 (C++20) > std::ranges::view, std::ranges::enable_view, std::ranges::view_base
std::ranges::view, std::ranges::enable_view, std::ranges::view_base
| 定义于头文件 <ranges>
|
||
| template<class T> concept view = ranges::range<T> && std::semiregular<T> && ranges::enable_view<T>; |
(1) | |
| template<class T> inline constexpr bool enable_view = std::derived_from<T, ranges::view_base>; |
(2) | |
| struct view_base { }; |
(3) | |
1) view 概念指定拥有常数时间å¤åˆ¶ã€ç§»åŠ¨åŠèµ‹å€¼æ“作的 range 类型（例如一对è¿ä»£å™¨æˆ–æŒ‰éœ€åˆ›å»ºå…¶å…ƒç´ çš„ç”Ÿæˆå™¨
range 。值得注æ„çš„æ˜¯æ ‡å‡†åº“å®¹å™¨æ˜¯ range 但ä¸æ˜¯ view ）。2) enable_view å˜é‡æ¨¡æ¿ç”¨äºŽæŒ‡ç¤º range 是å¦ä¸º view ã€‚è‹¥ç±»åž‹å…¬å¼€ä¸”æ— æ§ä¹‰åœ°æ´¾ç”Ÿè‡ª view_base ，则默认认为它是视图。
用户å¯å¯¹è¦å®žçŽ°
view çš„æ— cv é™å®šçš„程åºå®šä¹‰ç±»åž‹ç‰¹åŒ– enable_view 为 true ，而对ä¸å®žçŽ°çš„类型特化为 false 。这些特化应当å¯ç”¨äºŽå¸¸é‡è¡¨è¾¾å¼å¹¶æ‹¥æœ‰ const bool 类型。