I'm experimenting with template template parameters. I have no problems to make them work with classes but for some reason it does not work with functions.
enum class MyEnum { A, B, C, D};
template<class EnumType, template<EnumType> class Fun >
class MyTest
{
}
template<MyEnum myEnum>
void freeFunc(int argument)
{
LOG_ERROR(" void freeFunc(int argument) default case!!! ");
}
template<>
void freeFunc<MyEnum::A>(int argument); // implemented in cpp
template<>
void freeFunc<MyEnum::B>(int argument); // implemented in cpp
template<>
void freeFunc<MyEnum::C>(int argument); // implemented in cpp
template<>
void freeFunc<MyEnum::D>(int argument); // implemented in cpp
template<MyEnum s>
class Cde
{
public:
};
MyTest<MyEnum, Cde > test1; // does compile
MyTest<MyEnum, freeFunc > test2; // does not compile
I don't understand why the test2 does not compile. It just says: error: expected a class template, got 'freeFunc'
What am I doing wrong?
[edit] what I'm looking for is a way to get a generic way to both get free functions and class template templatized on an enum class
Note that function templates can't be used as template template argument ,
A template argument for a template template parameter must be an id-expression which names a class template or a template alias.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.