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# insert_range

### Synopsis

    template<
          typename Sequence
        , typename Pos
        , typename Range
        >
    struct insert_range
    {
        typedef unspecified type;
    };

### Description

`insert_range` performs an insertion of a range of elements at an arbitrary position in the sequence.

### Header

    #include <boost/mpl/insert_range.hpp>

### Model of

Tag Dispatched Metafunction

### Parameters

Parameter | Requirement | Description
--- | --- | ---
`Sequence` | Extensible Sequence or Extensible Associative Sequence | A sequence to insert into.
`Pos` | Forward Iterator | An iterator in `Sequence` specifying the insertion position.
`Range` | Forward Sequence | The range of elements to be inserted.

### Expression semantics

For any Extensible Sequence `s`, iterator `pos` in `s`, and Forward Sequence `range`:

    typedef insert<s,pos,range>::type r;

Return type: | Extensible Sequence.
Precondition: | `pos` is an iterator into `s`.
Semantics: | `r` is a sequence, concept-identical to `s`, of the following elements: [`begin<s>::type`, `pos`), [`begin<r>::type`, `end<r>::type`), [`pos`, `end<s>::type`).

Postcondition:

The relative order of the elements in `r` is the same as in `s`;

    size<r>::value == size<s>::value + size<range>::value

### Complexity

Sequence dependent. Quadratic in the worst case, linear at best; see the particular sequence class' specification for details.

### Example

    typedef vector_c<int,0,1,7,8,9> numbers;
    typedef find< numbers,integral_c<int,7> >::type pos;
    typedef insert_range< numbers,pos,range_c<int,2,7> >::type range;

    BOOST_MPL_ASSERT_RELATION( size<range>::value, ==, 10 );
    BOOST_MPL_ASSERT(( equal< range,range_c<int,0,10> > ));

    typedef insert_range<
          list0<>
        , end< list0<> >::type
        , list<int>
        >::type result2;

    BOOST_MPL_ASSERT_RELATION( size<result2>::value, ==, 1 );

### See also

Extensible Sequence, `insert`, `push_front`, `push_back`, `erase`