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std::valarray::size

STD：：valArray：：size

std::size_t size() const;​​

返回值数组中的元素数。

参数

%280%29

返回值

值数组中的元素数。

例

二次

#include <iostream>
#include <valarray>
 
int main()
{
    std::valarray<double> a = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    std::cout << "Average: " << a.sum()/a.size() << '\n';
}

二次

产出：

二次

Average: 5.5

二次

另见

resizechanges the size of valarray (public member function)

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