c++ - Is it possible to make a string as a template parameter? -

is possible make string template parameter , how? like

a<"okay"> type. 

any string (std::string or c-string) fine.

yes, need put in variable external linkage (or c++11 remove requirement external linkage). basically, given:

template <char const* str> class { /* ... */ }; 

this:

extern char const okay[] = "okay";  a<okay> ... 

works. note thought not contents of string define uniqueness, object itself:

extern char const okay1[] = "okay"; extern char const okay2[] = "okay"; 

given this, a<okay1> , a<okay2> have different types.