多个整数型类C ++ [英] Multiple Integer-type classes in C++

问题描述

我经常使用整数重新在不同的空间present价值发现自己。例如...

I often find myself using Integers to represent values in different "spaces". For example...

int arrayIndex;
int usersAge;
int daysToChristmas;

在理想情况下，我想有单独的类为这些类型的指数，年和天，这应该prevent我不小心把它们组合起来。类型定义是从documnentation角度帮助，但不是类型安全就好了。

Ideally, I'd like to have separate classes for each of these types "Index","Years" and "Days", which should prevent me accidentally mixing them up. Typedefs are a help from a documnentation perspective, but aren't type-safe enough.

我试过包装类，但我喜欢太多的样板结束。有一个简单的基于模板的解决方案，或者在升压东西随时可以走？

I've tried wrapper classes, but end up with too much boilerplate for my liking. Is there a straightforward template-based solution, or maybe something ready-to-go in Boost?

编辑：有几个人谈了自己的答案边界检查。也许一个方便的副作用，但不是关键要求。特别是，我不只是想prevent外结合的分配，但不合适类型之间的分配。

Several people have talked about bounds-checking in their answers. That maybe a handy side-effect, but is NOT a key requirement. In particular, I don't just want to prevent out-of-bound assignments, but assignments between "inappropriate" types.

推荐答案

您可以尝试BOOST_STRONG_TYPEDEF。从升压/ strong_typedef.hpp ：

You could try BOOST_STRONG_TYPEDEF. From boost/strong_typedef.hpp:

// macro used to implement a strong typedef.  strong typedef
// guarentees that two types are distinguised even though the
// share the same underlying implementation.  typedef does not create
// a new type.  BOOST_STRONG_TYPEDEF(T, D) creates a new type named D
// that operates as a type T.

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