C++ address operator uses? [duplicate]

问题

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Possible Duplicate:
Why use pointers?

I know what the C++ & does. but what can it be used for?

回答1:

• & is used to pass address of arguments (pointer) to function, when it's used at calling site.
• & is used to pass arguments by reference to function, when it's used in function parameter list.
• & is bitwise AND. e.g. (a & b)
• & is used in logical AND. In this case, two & make logical AND. e.g (a && b).

回答2:

For example to pass a pointer to your object into some function.

回答3:

Many functions in the STL or other commonly available libraries requires a pointer to an object (not the object itself). Also, many time you'll want to pass pointers. When you need that, the & operator allows you to get a pointer to any object you have access to.

Browse through the boost libraries and find some. One example:

template<class Y> explicit shared_ptr(Y * p);

To pass in a pointer to a Y you'd have to use the & operator.

Furthermore, your profile says you're into 3-d games. Almost every C++ 3d library I know of uses pointers to arrays of floats or ints to manipulate everything. You need the & operator to pass in the pointers to those arrays.

来源：https://stackoverflow.com/questions/5051894/c-address-operator-uses