Identifying primitive types in templates

Question

I am looking for a way to identify primitives types in a template class definition.

I mean, having this class :

template
class A{
void         


        

Answer 1

I guess this can do the job quite nicely, without multiple specializations:

# include 
# include 

template 
inline bool isPrimitiveType(const T& data) {
    return std::is_fundamental::value;
}

struct Foo {
    int x;
    char y;
    unsigned long long z;
};


int main() {

    Foo data;

    std::cout << "isPrimitiveType(Foo): " << std::boolalpha
        << isPrimitiveType(data) << std::endl;
    std::cout << "isPrimitiveType(int): " << std::boolalpha
        << isPrimitiveType(data.x) << std::endl;
    std::cout << "isPrimitiveType(char): " << std::boolalpha
        << isPrimitiveType(data.y) << std::endl;
    std::cout << "isPrimitiveType(unsigned long long): " << std::boolalpha
        << isPrimitiveType(data.z) << std::endl;

}

And the output is:

isPrimitiveType(Foo): false  
isPrimitiveType(int): true  
isPrimitiveType(char): true  
isPrimitiveType(unsigned long long): true