Re: [Boost-users] Unique parameter values for interfaces

Subject: Re: [Boost-users] Unique parameter values for interfaces
From: Peter Bartlett (pete_at_[hidden])
Date: 2009-05-06 05:35:55

Quoting Roman Perepelitsa <roman.perepelitsa_at_[hidden]>:

> 2009/5/6 Ryan McConnehey <mccorywork_at_[hidden]>
>
>>  Roman Perepelitsa wrote:
>>
>> template<typename S, *int N*>
>> struct ParameterValue
>> {
>>    ParameterValue(S value_) : value(value_) {}
>>    S value
>> };
>>
>> typedef ParameterValue<std::string, *0*>   ConfigName;
>> typedef ParameterValue<std::string, *1*>   PathName;
>>
>> Roman Perepelitsa.
>>
>>
>> Is is possible to have the number be generated automatically so that it
>> doesn't need to be defined by the user?
>>
>
> I don't think so. If you want to protect yourself from accidentally using
> the same number with different types, you can try the following:
> [...]

In addition to tagging, you can also look into whether true_typedef is  
suitable. Matthew Wilson's STLSoft has an implementation.

There is also a strong_typedef in Boost but I think it should be  
regarded as implementation detail of the serialization library and  
thus comes with caveats.