还有 求和、 求 平均值、计数、 求最大值、 求最小值等库函数。

It provides Data Definition Language (DDL) , Data Manipulation Language (DML) , as well built-in functions, such as:Sum, Average, Count, Maximum and Minimum.

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但是只能通过递归模板或者扩展函数来完成其他两种常见的操作：求最大值和最小值。

But, you can only accomplish two other popular operations on a set of Numbers, finding the minimum and maximum, by a recursive template or extension function.

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求所有插槽返回值的最大值，这样的信号结果才有点意思。为些，我们创建一个自定义合并器如下。

A more interesting signal result would be the maximum of the values returned by any slot. To do this, we create a custom combiner that looks like this.

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