区分左值和右值,并举例说明。
Distinguish between an lvalue and an rvalue; show examples of each.
这个宏中的左值和右值必须是相同类型的 — 即要么是 float,要么是 double。
The left and right values in the macro must be of the same type—float or double.
对于一个给定的维,有3个wgrow值要考虑:两个边(左和右,或者上和下)和child值本身。
Given a dimension, you have three wGrow values to consider: two of the sides (left and right, or top and bottom) and the child's value itself.
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