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Wikipedia

Function object:

A function objectefn is a computer programming construct allowing an object to be invoked or called as if it were an ordinary function, usually with the same syntax (a function parameter that can also be a function).

函数对象:

函数对象（function object）In C++, a functionoid is an object that has one major method, and a functor is a special case of a functionoid. They are similar to a function object, "but not the same".是一个程序设计的对象允许被当作普通函数来调用。