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source: downloads/boost_1_34_1/libs/mpl/doc/src/refmanual/clear.rst @ 29

Last change on this file since 29 was 29, checked in by landauf, 17 years ago

updated boost from 1_33_1 to 1_34_1
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clear

Synopsis

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

Description

Returns an empty sequence |concept-identical| to Sequence.

Parameters

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

Expression semantics

For any |Extensible Sequence| or |Extensible Associative Sequence| s:

typedef clear<s>::type t;
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.

Complexity

Amortized constant time.

Example

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

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