# Poco

# template < typename T0 = NullTypeList, typename T1 = NullTypeList, typename T2 = NullTypeList, typename T3 = NullTypeList, typename T4 = NullTypeList, typename T5 = NullTypeList, typename T6 = NullTypeList, typename T7 = NullTypeList, typename T8 = NullTypeList, typename T9 = NullTypeList, typename T10 = NullTypeList, typename T11 = NullTypeList, typename T12 = NullTypeList, typename T13 = NullTypeList, typename T14 = NullTypeList, typename T15 = NullTypeList, typename T16 = NullTypeList, typename T17 = NullTypeList, typename T18 = NullTypeList, typename T19 = NullTypeList, typename T20 = NullTypeList, typename T21 = NullTypeList, typename T22 = NullTypeList, typename T23 = NullTypeList, typename T24 = NullTypeList, typename T25 = NullTypeList, typename T26 = NullTypeList, typename T27 = NullTypeList, typename T28 = NullTypeList, typename T29 = NullTypeList, typename T30 = NullTypeList, typename T31 = NullTypeList, typename T32 = NullTypeList, typename T33 = NullTypeList, typename T34 = NullTypeList, typename T35 = NullTypeList, typename T36 = NullTypeList, typename T37 = NullTypeList, typename T38 = NullTypeList, typename T39 = NullTypeList >

# struct TypeListType

Library: Foundation
Package: Core
Header: Poco/TypeList.h

## Description

Get the type at index N from a TypeList TypeListType - creates a TypeList from up to 40 type parameters. NullTypeList parameters are filtered out.

## Types Aliases

### HeadType

using HeadType = typename Detail::FilterNullTypeList < T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22, T23, T24, T25, T26, T27, T28, T29, T30, T31, T32, T33, T34, T35, T36, T37, T38, T39 >::Type;