The MPL Reference Manual: Integral Sequence Wrapper

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# Integral Sequence Wrapper

### Description

An Integral Sequence Wrapper is a class template that provides a concise interface for creating a corresponding sequence of Integral Constants. In particular, assuming that `seq` is a name of the wrapper's underlying sequence and c1,c2,... cn are integral constants of an integral type `T` to be stored in the sequence, the wrapper provides us with the following notation:

> `seq_c<T`,c1,c2,... cn`>`

If `seq` is a Variadic Sequence, numbered wrapper forms are also avaialable:

> `seq`n`_c<T`,c1,c2,... cn`>`

### Expression requirements

In the following table and subsequent specifications, `seq` is a placeholder token for the Integral Sequence Wrapper's underlying sequence's name.

Expression | Type | Complexity
--- | --- | ---
`seq_c<T`,c1,c2,... cn`>` | Forward Sequence | Amortized constant time.
`seq_c<T`,c1,c2,... cn`>::type` | Forward Sequence | Amortized constant time.
`seq_c<T`,c1,c2,... cn`>::value_type` | An integral type | Amortized constant time.
`seq`n`_c<T`,c1,c2,... cn`>` | Forward Sequence | Amortized constant time.
`seq`n`_c<T`,c1,c2,... cn`>::type` | Forward Sequence | Amortized constant time.
`seq`n`_c<T`,c1,c2,... cn`>::value_type` | An integral type | Amortized constant time.

### Expression semantics

    typedef seq_c<T,c1,c2,... cn> s;
    typedef seqn_c<T,c1,c2,... cn> s;

Semantics: | `s` is a sequence `seq` of integral constant wrappers `integral_c<T,`c1`>`, `integral_c<T,`c2`>`, ... `integral_c<T,`cn`>`.
Postcondition: | `size<s>::value == n`.

    typedef seq_c<T,c1,c2,... cn>::type s;
    typedef seqn_c<T,c1,c2,... cn>::type s;

Semantics: | `s` is identical to `seq`n`<``integral_c<T,`c1`>`,`integral_c<T,`c2`>`, ... `integral_c<T,`cn`>` `>`.

    typedef seq_c<T,c1,c2,... cn>::value_type t;
    typedef seqn_c<T,c1,c2,... cn>::value_type t;

Semantics: | `is_same<t,T>::value == true`.

### Models

- `vector_c`
- `list_c`
- `set_c`

### See also

Sequences, Variadic Sequence, Integral Constant