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std::valarray::sum

STD：：valArray：：sum

T sum() const;​​

计算元素的和。

只有在下列情况下才能使用该函数operator+=是为类型定义的。T.如果std::valarray为空，则行为未定义。此函数处理元素的顺序未指定。

参数

%280%29

返回值

元素之和。

例

二次

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

二次

产出：

二次

55

二次

另见

applyapplies a function to every element of a valarray (public member function)
accumulatesums up a range of elements (function template)

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