std::experimental::any:: empty
From cppreference.net
<
cpp
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experimental
|
any
C++
Experimental
| Technical Specification | ||||
| Filesystem library (filesystem TS) | ||||
| Library fundamentals (library fundamentals TS) | ||||
| Library fundamentals 2 (library fundamentals TS v2) | ||||
| Library fundamentals 3 (library fundamentals TS v3) | ||||
| Extensions for parallelism (parallelism TS) | ||||
| Extensions for parallelism 2 (parallelism TS v2) | ||||
| Extensions for concurrency (concurrency TS) | ||||
| Extensions for concurrency 2 (concurrency TS v2) | ||||
| Concepts (concepts TS) | ||||
| Ranges (ranges TS) | ||||
| Reflection (reflection TS) | ||||
| Mathematical special functions (special functions TR) | ||||
| Experimental Non-TS | ||||
| Pattern Matching | ||||
| Linear Algebra | ||||
| std::execution | ||||
| Contracts | ||||
| 2D Graphics |
std::experimental::any
| Member functions | ||||
| Modifiers | ||||
| Observers | ||||
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any::empty
|
||||
| Non-member functions | ||||
|
bool
empty
(
)
const
noexcept
;
|
(库基础技术规范) | |
检查对象是否包含值。
参数
(无)
返回值
true 表示实例为空，否则为 false 。