How to create template type of enum

Question

enum MyEnum{
  task1 = 0,
  task2 
};

// template<MyEnum T>  works
template<class T>
void fun(){

}


int main(){
 fun<MyEnum::task1>();
//  fun<int>(); works
}

When I try to create a template out of enum I get error saying no matching function for call to ‘fun()

Why does the int work by not enum type?

When I do template<MyEnum T> it works but I dont understand why.

Because then you aren't asking for a type, you're asking for a value. If you have typename or class you are asking for a type. If you have a type, then you are asking for a value. — NathanOliver
– NathanOliver, Commented Feb 21, 2019 at 22:57
@mato template<MyEnum T> is a non-type template parameter. Similar to template<int I>. — 0x5453
– 0x5453, Commented Feb 21, 2019 at 22:57

Sid S · Accepted Answer · 2019-02-22 00:18:02Z

1

Why does the int work by not enum type?

It does work for enum type just like it does for int type.

Just like fun<int>(); works, fun<MyEnum>(); works

And just like fun<1>(); doesn't work, fun<MyEnum::task1>(); doesn't work.

To make it work for values, like 1 or MyEnum::task1, you need to declare the template parameter differently, e.g.

template<int v>

or

template<MyEnum v>

answered Feb 22, 2019 at 0:18

Sid S

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