clear

template<
      typename Sequence
    >
struct clear
{
    typedef unspecified type;
};

Returns an empty sequence concept-identical to Sequence.

#include <boost/mpl/clear.hpp>

Parameter	Requirement	Description
`Sequence`	Extensible Sequence or Extensible Associative Sequence	A sequence to get an empty "copy" of.

typedef clear<s>::type t;

Return type: Extensible Sequence or Extensible Associative Sequence.

Semantics:

Return type:	Extensible Sequence or Extensible Associative Sequence.
Semantics:	Equivalent to typedef erase< s, begin<s>::type, end<s>::type >::type t;
Postcondition:	`empty<s>::value == true`.

Equivalent to

typedef erase< s, begin<s>::type, end<s>::type >::type t;

Postcondition: empty<s>::value == true.

Amortized constant time.

typedef vector_c<int,1,3,5,7,9,11> odds;
typedef clear<odds>::type nothing;

BOOST_MPL_ASSERT(( empty<nothing> ));