Implicit Template Parameters

Question

The following code generates a compile error in Xcode:

template 
struct Foo
{
    Foo(T Value)
    {
    }
};

int main()
{
    Foo MyFoo(123);         


        

Answer 1

It makes a lot of sense it is like this, as Foo is not a class, only Foo where T is a type.

In C++0x you can use auto, and you can create a function to make you a Foo, let's call it foo (lower case f). Then you would do

template Foo foo(int x)
{
  return Foo(x);
}

auto myFoo = foo(55);