November 01, 2005
An Efficient Variant Type
Listing 6
template<typename T>
struct optimize
{
enum
{
T_size_ = sizeof(T)
, base_size_ = sizeof(object_holder)
, size_ok_ = (T_size_ <= base_size_)
, value = size_ok_
};
};
template<typename T>
struct table
{
enum { optimized = sizeof(T) <= sizeof(object_holder) };
static fxn_ptr_table* get()
{
static fxn_ptr_table static_table = {
&fxns<optimized>::template impl<T>::type
, &fxns<optimized>::template impl<T>::destructor
, &fxns<optimized>::template impl<T>::static_delete
, &fxns<optimized>::template impl<T>::clone
, &fxns<optimized>::template impl<T>::assign
, &fxns<optimized>::template impl<T>::is_optimized
, &fxns<optimized>::template impl<T>::swap
};
return &static_table;
}
};
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