| Front Page / Sequences / Intrinsic Metafunctions / sequence_tag | 
template<
      typename X
    >
struct sequence_tag
{
    typedef unspecified type;
};
sequence_tag is a tag metafunctions for all tag dispatched intrinsic sequence operations.
#include <boost/mpl/sequence_tag.hpp>
| Parameter | Requirement | Description | 
|---|---|---|
| X | Any type | A type to obtain a sequence tag for. | 
For any arbitrary type x:
typedef sequence_tag<x>::type tag;
| Return type: | A type. | 
|---|---|
| Semantics: | tag is an unspecified tag type for x. | 
Amortized constant time.