std::flat_multimap<Key,T,Compare,KeyContainer,MappedContainer>:: max_size
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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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| Associative | ||||
| Unordered associative | ||||
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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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| Iterator invalidation | ||||
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size_type max_size
(
)
const
noexcept
;
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(自 C++23 起) | |
返回容器由于系统或库实现限制所能容纳的最大元素数。等价于 std:: min < size_type > ( c. keys . max_size ( ) , c. values . max_size ( ) ) 。
目录返回值最大元素数量。 复杂度常量。 注释
该值通常反映容器大小的理论上限，最多为
std::
numeric_limits
<
difference_type
>
::
max
(
)
。在运行时，容器的实际大小可能受可用内存容量限制，从而小于
示例运行此代码 #include <iostream>
#include <flat_map>
#include <locale>
int main()
{
std::flat_multimap<char, char> q;
std::cout.imbue(std::locale("en_US.UTF-8"));
std::cout << "Maximum size of a std::flat_multimap is " << q.max_size() << '\n';
}
可能的输出： Maximum size of a std::flat_multimap is 9,223,372,036,854,775,807
参见
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