functional

以函数为参数的函数；更精确地说,其自变量在实值或复值函数空间中变化,且值域为一维空间的函数。

A function that takes a function as its argument; more precisely, a function whose argument varies in a space of (real- or complex-valued) functions and whose value belongs to a monodimensional space.

向量空间上的标量值线性函数。

A scalar-valued linear function on a vector space.

封装函数指针(或等价物)的对象。

An object encapsulating a function pointer (or equivalent).