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std::thread::hardware_concurrency

线程：：硬件[医]并发性

static unsigned hardware_concurrency(​(since C++11)

返回实现支持的并发线程数。该值只应视为提示。

参数

%280%29

返回值

支持的并发线程数。如果该值未定义好或不可计算，则返回​0​...

例外

noexcept规格：

noexcept

例

二次

#include <iostream>
#include <thread>
 
int main() {
    unsigned int n = std::thread::hardware_concurrency(
    std::cout << n << " concurrent threads are supported.\n";
}

二次

可能的产出：

二次

4 concurrent threads are supported.

二次

另见

hardware_destructive_interference_sizehardware_constructive_interference_size (C++17)min offset to avoid false sharingmax offset to promote true sharing (constant)

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