You then can call the functions using standard function call syntax, by combining this prefix with the name of the method to be invoked.
然后通过组合该前缀与被调用方法的名称，可以使用标准的函数调用语法调用函数。
Just as iterators are a generalization of Pointers, function objects are a generalization of functions: a function object is anything that you can call using the ordinary function call syntax.
正像iterators是指针的一般化，函数对象是函数的一般化：一个函数对象是你可以使用普通函数调用语法。
Think of this as a function that takes two techs arguments, the first of which is univs and the second of which is techs. And this is just a different syntax for writing that function call.
想下有两个参数的函数，第一个是univs第二个是，这就是对于函数调用的，不同语法的书写规则。
The syntax mimics a function call.
这个语法模仿了函数调用。
When we call a member function, we (usually) specify the object on which the function will operate. This syntax uses the dot operator (the ". " operator)
当调用成员函数时，（通常）指定函数要操作的对象。语法是使用点操作符（。）
When we call a member function, we (usually) specify the object on which the function will operate. This syntax uses the dot operator (the ". " operator)
当调用成员函数时，（通常）指定函数要操作的对象。语法是使用点操作符（。）
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