《C++ templates》的Expression Templates一问

boodweb 2006-02-04 11:19:10

18.2中说Scalar必须用值传递，我怎么也搞不懂原因
有没有看明白的解释一下？

谢谢！

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healer_kx 2006-02-07

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其实只要能够生成计算表达式就可以了。关键在于那个double类型的萃取，是不是引用都是无所谓的。

healer_kx 2006-02-07

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Sorry，我才看到你说得那个问题了。。。看来我真的是理解错了。
它的意思可能是说Scalar对象是在编译过程中产生的函数operaor * 的那个
return的A_Scalar<T>(s);它是一个临时对象。
用白话说，你是引用不住它的，(它在构造后就会失效)

我还得再理解一下。。。。。。还有些问题没有想通呢。

healer_kx 2006-02-07

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我把那一章的代码都敲了一遍。。。我这里是可以的。
要么是我没有理解你的意思。。。
我的MSN个人空间是http://spaces.msn.com/healerkx
上面的代码你可以在VC7上运行下。
顺便我们再讨论一下。

healer_kx 2006-02-07

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我再看看，我怎么不觉得啊。看完了再答复您。

boodweb 2006-02-07

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可是书上明明特别指出说会有问题啊……

boodweb 2006-02-06

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楼上地可以详细解释一下么？
为什么书上那么实现就一定要值传递？

healer_kx 2006-02-06

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可以，谁说一定是数了，当然了，这也需要你改变operator*的声明和实现了。

wshcdr 2006-02-06

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