在C ++中设计点积运算符 [英] designing a dot product operator in c++

问题描述

我希望能够编写类似a = b.c的语句；其中b和c是std :: vector，a是它们的标量点积(双精度).为此，我应将点积运算符与."关联.象征.这可能吗?

I would like to be able to write statements like a = b.c; where b and c are std::vector and a is their scalar dot product (double). For doing this, I should associate the dot product operation with '.' symbol. Is this possible?

推荐答案

您不能覆盖点运算符(.).

You cannot override the dot-operator (.).

此外，即使您可能永远也不应为此目的.覆盖运算符时，应遵循以下三个规则:

Moreover, even if you could you never should for this purpose. When overriding operators, you should follow these three rules :

1. 如果运算符的含义不明确，则不应重载.
2. 始终符合操作员的众所周知的语义.
3. 始终为一组相关运算符的 all 提供重载.

1. If the meaning of an operator is ambigious, it should not be overloaded.
2. Always conform to the operator's well-known semantics.
3. Always provide overloads for all of a related group of operators.

您的预期设计违反了第二条规则:您希望彻底改变点运算符的语义.

Your intended design violates the second rule: you wish to drastically change the semantics of the dot-operator.

您应该提供自己的函数来执行点运算，而不是这样做.

Instead of doing this, you should provide your own function to perform the dot operation.

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