C++ template specialization without default function

I have the following code that compiles and works well:

template<typename T>
T GetGlobal(const char *name);

template<>
int GetGlobal<int>(const char *name);

template<>
double GetGlobal<double>(const char *name);

However I want to remove the "default" function. That is, I want to make all calls to GetGlobal<t> where 't' is not an int or a double an error.

For example, GetGlobal<char>() should be a compile time error.

I tried to just delete the default function, but, as I imagined, I received a lot of errors.. So is there a way to "disable" it and allow calls only to the specialized versions of the function?

Thanks!