Can i do something like
template<class Key, class Data, class Compare = less<Key>, template<typename T> class Allocator<T> = allocator<T> >
class mymap {
typedef map<Key,Data,Compare,Allocator<pair<const Key, Data> > > storageMap;
typedef vector<Data,Allocator<Data> > storageVector;
}
So template is passed to the class unspecialiazed and instantiated later.
Yes, here's a minimal compileable example:
#include <map>
#include <vector>
using namespace std;
template <
class Key,
class Data,
class Compare = less<Key>,
template <typename T> class Allocator = allocator
>
class mymap
{
public:
typedef map<Key,Data,Compare,Allocator<pair<const Key, Data> > > storageMap;
typedef vector<Data,Allocator<Data> > storageVector;
};
int main()
{
mymap<int,long>::storageMap m;
mymap<int,long>::storageVector v;
return 0;
}
Yes, it's called a "template-template parameter", and the syntax is
template <class Key, class Data, class Compare = less<Key>,
template <typename T> class Allocator = allocator >
class mymap {
typedef map<Key,Data,Compare,Allocator<pair<const Key, Data> > > storageMap;
typedef vector<Data,Allocator<Data> > storageVector;
}
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