I have the following code:
enum foo
{
null_foo,
foo1,
foo2
};
template<typename T>
struct data
{
T val;
bool set;
template<typename U>
data<T>& operator=(const U &that)
{
val = that;
set = true;
return *this;
}
};
struct foo_1 { };
struct foo_2 { };
template<typename T> struct map_foo_type { static foo const id =
null_foo; }; // worst match
template<> struct map_foo_type<foo_1> { static foo const id = foo1; };
template<> struct map_foo_type<foo_2> { static foo const id = foo2; };
Using the above code, I want to be able to do the following:
data<int> mid = map_foo_type<foo1>::id;
When I compile with gcc 3.3.6 I get a linker error - undefined symbol
mep_foo_type<foo1>::id
If I have an intermediate step:
foo id = map_foo_type<foo1>::id
data<int> mid = id;
then it links fine.
Alternately, if I change operator= above to take const U data, rather
than a reference to const U, it also links fine!
What is the problem please?
Thanks
Steve
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