[英]Passing unspecialized template as a template parameter
我可以做点什么
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;
}
因此,模板将被非专业地传递给该类,并在以后实例化。
是的,这是一个最小的可编译示例:
#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;
}
是的,它称为“模板模板参数”,其语法为
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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