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

Subject: Re: [Boost-users] Unique parameter values for interfaces
From: Roman Perepelitsa (roman.perepelitsa_at_[hidden])
Date: 2009-05-06 04:43:23

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:

template<typename S, *typename Tag*>
struct ParameterValue
{
   ParameterValue(S value_) : value(value_) {}
   S value
};

*struct ConfigNameTag {};*
typedef ParameterValue<std::string, *ConfigNameTag*>   ConfigName;
*struct PathNameTag {};*
typedef ParameterValue<std::string, *PathNameTag*>   PathName;

Roman Perepelitsa.