运算符
运算符重载是通过 std::ops
中的特征实现的:
Speaker Notes
This slide should take about 10 minutes.
讨论点:
- You could implement
Add
for&Point
. In which situations is that useful?- 回答:
Add:add
会耗用self
。如果您的运算符重载对象 (即类型T
)不是Copy
,建议您也为&T
重载运算符。这可避免调用点上存在不必要的 克隆任务。
- 回答:
- 为什么
Output
是关联类型?可将它用作该方法的类型形参吗?- Short answer: Function type parameters are controlled by the caller, but associated types (like
Output
) are controlled by the implementer of a trait.
- Short answer: Function type parameters are controlled by the caller, but associated types (like
- 您可以针对两种不同类型实现
Add
,例如,impl Add<(i32, i32)> for Point
会向Point
中添加元组。