Provides various traits for template packs. More...
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Namespaces | |
seqan3 | |
The main SeqAn3 namespace. | |
seqan3::pack_traits | |
Namespace containing traits for working on type packs. | |
Functions | |
Type pack traits (return a single type) | |
template<ptrdiff_t idx, typename... pack_t> | |
seqan3::pack_traits::requires (idx >=0 &&idx< sizeof...(pack_t))||(-idx< | |
Return the type at given index from the type pack. More... | |
template<typename... pack_t> | |
seqan3::pack_traits::requires (sizeof...(pack_t) > 0) using front = typename decltype((std::type_identity<pack_t>{}, ...))::type | |
Return the first type from the type pack. More... | |
Variables | |
Type pack traits (return a value) | |
template<typename query_t , typename... pack_t> | |
constexpr bool | seqan3::pack_traits::contains = (find<query_t, pack_t...> != -1) |
Whether a type occurs in a pack or not. More... | |
template<typename query_t , typename... pack_t> | |
constexpr ptrdiff_t | seqan3::pack_traits::count = (std::is_same_v<query_t, pack_t> + ... + 0) |
Count the occurrences of a type in a pack. More... | |
template<typename query_t , typename... pack_t> | |
constexpr ptrdiff_t | seqan3::pack_traits::find = seqan3::pack_traits::detail::find<query_t, pack_t...>() |
Get the index of the first occurrence of a type in a pack. More... | |
template<template< typename > typename pred_t, typename... pack_t> | |
constexpr ptrdiff_t | seqan3::pack_traits::find_if = seqan3::pack_traits::detail::find_if<pred_t, pack_t...>() |
Get the index of the first type in a pack that satisfies the given predicate. More... | |
template<typename... pack_t> | |
constexpr size_t | seqan3::pack_traits::size = sizeof...(pack_t) |
The size of a type pack. More... | |
Type pack traits (return a type list) | |
template<typename replace_t , std::ptrdiff_t i, typename... pack_t> | |
seqan3::pack_traits::requires (i >=0 &&i< size< pack_t... >) using replace_at | |
Replace the type at the given index with the given type. More... | |
template<ptrdiff_t i, typename... pack_t> | |
seqan3::pack_traits::requires (i >=0 &&i<=size< pack_t... >) using take = typename decltype(detail::split_after<i, pack_t...>(type_list<>{}))::second_type | |
Return a seqan3::type_list of the first n types in the type pack. More... | |
template<template< typename > typename trait_t, typename... pack_t> | |
using | seqan3::pack_traits::transform = seqan3::type_list< trait_t< pack_t >... > |
Apply a transformation trait to every type in the pack and return a seqan3::type_list of the results. More... | |
Provides various traits for template packs.