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

6 May 2009

      2009/5/6 Ryan McConnehey <mccorywork@gmail.com>
...
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.