在书中《C++ Template》中的15.1.6中提到：
The major advantage of accessing policy classes through template template parameters is that it makes it easier to have a policy class carry with it some state information (that is, static data members) with a type that depends on the template parameters. (In our first approach the static data members would have to be embedded in a member class The major adva
The major advantage of accessing policy classes through template template parameters is that it makes it easier to have a policy class carry with it some state information (that is, static data members) with a type that depends on the template parameters. (In our first approach the static data members would have to be embedded in a member class The major adva
