template struct question

[WhatMeWorry]

```
void main()
{

struct HexBoard(F,I)
{
     this(F d, I r, I c) {}
     //void displayHexBoard(HexBoard!(F,I) h) {}  // this compiles 
fine!
}

void displayHexBoard(HexBoard!(F,I) h) {}  // error undefined 
identifier F and I


auto h1 = HexBoard!(float,uint)(.25, 3, 7);
auto h2 = HexBoard!(double,int)(.3, 5, 5);

}


Is there any clever way to move the method outside of a templated 
block structure?  Or is this as good as it gets.

I tried
// Explicit instantiation for 'int' type
//int add!(int, int);
void displayHexBoardData(HexBoard2!(float,uint) h);  // 
declaration

but that just returns
Error: declaration `displayHexBoard` is already defined
onlineapp.d(10):        `function` `displayHexBoard` is defined 
here