Back to Arangodb

Boost.Hana: Details

3rdParty/boost/1.78.0/libs/hana/doc/html/group__group-details.html

3.12.9.110.0 KB
Original Source

| | Boost.Hana 1.7.1

Your standard library for metaprogramming | |

Embedded content

Classes | Macros | Typedefs

Details

Description

Implementation details. Do not rely on anything here, even if it is documented.

|

Classes

| | struct | boost::hana::detail::any_of< Predicate, T > | | | Returns whether the Predicate is satisfied by any of the T.... More...
| | | | struct | boost::hana::detail::array< T, Size > | | | A minimal std::array with better constexpr support. More...
| | | | struct | boost::hana::detail::CanonicalConstant< T > | | | Tag representing a canonical Constant. More...
| | | | struct | boost::hana::detail::create< T > | | | Implementation of the generic std::make_xxx pattern for arbitrary xxxs. More...
| | | | struct | boost::hana::detail::decay< T, U > | | | Equivalent to std::decay, except faster. More...
| | | | struct | [boost::hana::detail::first_unsatisfied_index< Pred >](structboost_1_1hana_1_1detail_1_1first unsatisfied index.html) | | | Returns the index of the first element which does not satisfy Pred, or sizeof...(Xs) if no such element exists. [More...](structboost_1_1hana_1_1detail_1_1first unsatisfied index.html#details)
| | | | struct | boost::hana::detail::has_duplicates< T > | | | Returns whether any of the Ts are duplicate w.r.t. hana::equal. More...
| | | | struct | boost::hana::detail::nested_by< Algorithm > | | | Provides a .by static constexpr function object. More...
| | | | struct | boost::hana::detail::nested_than< Algorithm > | | | Provides a .than static constexpr function object. More...
| | | | struct | boost::hana::detail::nested_to< Algorithm > | | | Provides a .to static constexpr function object. More...
| | | | struct | boost::hana::detail::operators::adl<... > | | | Enables ADL in the hana::detail::operators namespace. More...
| | | | struct | [boost::hana::detail::std_common_type< T, U, typename >](structboost_1_1hana_1_1detail_1_1std common type.html) | | | Equivalent to std::common_type, except it is SFINAE-friendly and does not support custom specializations. [More...](structboost_1_1hana_1_1detail_1_1std common type.html#details)
| | | | struct | boost::hana::detail::type_at< n, T > | | | Classic MPL-style metafunction returning the nth element of a type parameter pack. More...
| | |

|

Macros

| | #define | BOOST_HANA_DISPATCH_IF(IMPL, ...) IMPL | | | Dispatch to the given implementation method only when a condition is satisfied. More...
| | | | #define | BOOST_HANA_PP_CONCAT(x, y) BOOST_HANA_PP_CONCAT_PRIMITIVE(x, y) | | | Expands to the concatenation of its two arguments.
| | | | #define | BOOST_HANA_PP_STRINGIZE(...) BOOST_HANA_PP_STRINGIZE_PRIMITIVE(__VA_ARGS__) | | | Expands to the stringized version of its argument.
| | | | #define | BOOST_HANA_PP_FRONT(...) BOOST_HANA_PP_FRONT_IMPL(__VA_ARGS__, ) | | | Expands to its first argument.
| | | | #define | BOOST_HANA_PP_DROP_FRONT(e0, ...) __VA_ARGS__ | | | Expands to all of its arguments, except for the first one. More...
| | | | #define | BOOST_HANA_PP_NARG(...) BOOST_HANA_PP_NARG_IMPL(__VA_ARGS__, 40,39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,) | | | Macro expanding to the number of arguments it is passed. More...
| | | | #define | BOOST_HANA_PP_BACK(...) BOOST_HANA_PP_BACK_IMPL(BOOST_HANA_PP_NARG(__VA_ARGS__), __VA_ARGS__) | | | Expands to its last argument.
| | | | #define | BOOST_HANA_PP_DROP_BACK(...) BOOST_HANA_PP_DROP_BACK_IMPL(BOOST_HANA_PP_NARG(__VA_ARGS__), __VA_ARGS__) | | | Expands to all of its arguments, except for the last one.
| | |

|

Typedefs

| | template<template< typename... > class Concept, typename T , typename U > | | using | boost::hana::detail::has_common_embedding = typename has_common_embedding_impl< Concept, T, U >::type | | | Returns whether T and U both have an embedding into a common type. More...
| | | | template<template< typename... > class Concept, typename T , typename U > | | using | boost::hana::detail::has_nontrivial_common_embedding = typename has_nontrivial_common_embedding_impl< Concept, T, U >::type | | | Returns whether T and U are distinct and both have an embedding into a common type. More...
| | |

Macro Definition Documentation

BOOST_HANA_DISPATCH_IF

| #define BOOST_HANA_DISPATCH_IF | ( | | IMPL, | | | | | ... | | | ) | | IMPL |

#include <boost/hana/detail/dispatch_if.hpp>

Dispatch to the given implementation method only when a condition is satisfied.

If the condition is satisfied, this macro is equivalent to the type IMPL. Otherwise, it is equivalent to a type with a deleted static function named apply. When a tag-dispatching error happens, the condition should be false and the deleted static function apply will prevent the compiler from generating too much garbage.

NoteWhen BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS is defined, the condition is always ignored and this macro expands to the implementation only.RemarksThis must be implemented as a macro, because we don't want the condition to be evaluated at all when BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS is defined.

BOOST_HANA_PP_DROP_FRONT

| #define BOOST_HANA_PP_DROP_FRONT | ( | | e0, | | | | | ... | | | ) | | __VA_ARGS__ |

#include <boost/hana/detail/preprocessor.hpp>

Expands to all of its arguments, except for the first one.

This macro may not be called with less than 2 arguments.

BOOST_HANA_PP_NARG

| #define BOOST_HANA_PP_NARG | ( | | ... | ) | BOOST_HANA_PP_NARG_IMPL(__VA_ARGS__, 40,39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,) |

#include <boost/hana/detail/struct_macros.hpp>

Macro expanding to the number of arguments it is passed.

Specifically, BOOST_HANA_PP_NARG(x1, ..., xn) expands to n. It is an error to call this macro with 0 arguments.

Typedef Documentation

has_common_embedding

template<template< typename... > class Concept, typename T , typename U >

| using boost::hana::detail::has_common_embedding = typedef typename has_common_embedding_impl<Concept, T, U>::type |

#include <boost/hana/detail/has_common_embedding.hpp>

Returns whether T and U both have an embedding into a common type.

If T and U do not have a common-type, this metafunction returns false.

has_nontrivial_common_embedding

template<template< typename... > class Concept, typename T , typename U >

| using boost::hana::detail::has_nontrivial_common_embedding = typedef typename has_nontrivial_common_embedding_impl<Concept, T, U>::type |

#include <boost/hana/detail/has_common_embedding.hpp>

Returns whether T and U are distinct and both have an embedding into a common type.

If T and U do not have a common-type, this metafunction returns false.