std::flat_set<Key,Compare,KeyContainer>:: extract
From zh.cppreference.net
C++
Containers library
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(C++17)
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(C++11)
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(C++26)
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(C++26)
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(C++11)
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(C++11)
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(C++11)
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(C++11)
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(C++11)
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(C++23)
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(C++23)
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(C++23)
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(C++23)
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(C++20)
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(C++23)
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std::flat_set
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container_type extract
(
)
&&
;
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(自 C++23 起) | |
提取适配后的容器
c
。等价于
return
std
::
move
(
c
)
;
。
在此操作后， * this 将变为空，即使抛出异常也是如此。
目录返回值std :: move ( c ) 。 复杂度常量。 示例运行此代码 #include <cassert>
#include <flat_set>
#include <print>
#include <type_traits>
#include <utility>
#include <vector>
int main()
{
std::flat_set<int> set{1, 2, 3};
const auto size{set.size()};
auto c{std::move(set).extract()};
assert(c.size() == size);
assert(set.empty());
// The default keys container is std::vector:
static_assert(std::is_same_v<decltype(c), std::vector<int>>);
std::println("{}", c);
}
输出： [1, 2, 3]
参见
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