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2.2 KiB
| title |
|---|
| parameter_pack |
{{< callout type="info">}}
Header: parameter_pack.h
For C++11 or above
{{< /callout >}}
{{< callout type="warning">}}
This class is deprecated.
Use etl::type_list as a replacement.
{{< /callout >}}
Compile time mapping of index to type and type to index for a template parameter pack.
parameter_pack
template <typename... TTypes>
class parameter_pack
Constants
static constexpr size_t size = sizeof...(TTypes);
Template alias
template <size_t Index, typename... TTypes>
using parameter_pack_t
= typename etl::parameter_pack<TTypes...>::template type_from_index_t<Index>;
Type from index and type list.
For C++17 or above
template <typename T, typename... TTypes>
inline constexpr size_t parameter_pack_v
= etl::parameter_pack<TTypes...>::template index_of_type<T>::value;
Index from type and type list.
The class contains two nested templates.
index_of_type
template <typename T>
class index_of_type
For C++17 or above
template <typename T>
static constexpr size_t index_of_type_v = index_of_type<T>::value;
type_from_index
template <size_t Index>
class type_from_index
template <size_t Index>
using type_from_index_t = typename type_from_index<Index>::type;
Examples
using Pack = etl::parameter_pack<char, short, int>;
constexpr size_t size = Pack::size; // size == 3
size_t indexChar = Pack::index_of_type_v<char>; // indexChar == 0
size_t indexShort = Pack::index_of_type_v<short>; // indexShort == 1
size_t indexInt = Pack::index_of_type_v<int>; // indexInt == 2
size_t indexLong = Pack::index_of_type_v<long>; // Static assert
// "T is not in parameter pack"
using type0 = typename Pack::type_from_index_t<0>; // type0 = char
using type1 = typename Pack::type_from_index_t<1>; // type1 = short
using type2 = typename Pack::type_from_index_t<2>; // type2 = int
using type3 = typename Pack::type_from_index_t<3>; // Static assert
// "Index out of bounds of parameter pack"