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;

You could use inheritance the use of numeric tagging.

template <typename T>
struct Param {
T value;
};

struct ConfigName : Param<string> { };
struct PathName : Param<string> { };