meta.hpp File Reference

Detailed Description

Metaprogramming, template variables and concepts.

Definition in file meta.hpp.

Go to the source code of this file.

#include <iosfwd>
#include <iterator>
#include <optional>
#include <type_traits>
#include <vector>
#include <userver/utils/meta_light.hpp>

This graph shows which files directly or indirectly include this file:

Typedefs
template<typename T>
using	meta::MapKeyType = DetectedType<impl::KeyType, T>
template<typename T>
using	meta::MapValueType = DetectedType<impl::MappedType, T>
template<typename T>
using	meta::RangeValueType = DetectedType<impl::RangeValueType, T>

Functions
template<typename T>
auto	meta::Inserter (T &container)
	Returns default inserter for a container.

Variables
template<typename T>
constexpr bool	meta::kIsVector = kIsInstantiationOf<std::vector, T>
template<typename T>
constexpr bool	meta::kIsRange = kIsDetected<impl::IsRange, T>
template<typename T>
constexpr bool	meta::kIsMap
	Returns true if T is an ordered or unordered map or multimap.
template<typename T>
constexpr bool	meta::kIsUniqueMap
	Returns true if T is a map (but not a multimap!)
template<typename T>
constexpr bool	meta::kIsRecursiveRange = std::is_same_v<DetectedType<impl::RangeValueType, T>, T>
template<typename T>
constexpr bool	meta::kIsIterator = impl::IsIterator<T>::value
template<typename T>
constexpr bool	meta::kIsOptional = kIsInstantiationOf<std::optional, T>
template<typename T>
constexpr bool	meta::kIsOstreamWritable = std::is_same_v<DetectedType<impl::OstreamWriteResult, T>, std::ostream&>
template<typename T, typename U = T>
constexpr bool	meta::kIsEqualityComparable = std::is_same_v<DetectedType<impl::EqualityComparisonResult, T, U>, bool>
template<typename T>
constexpr bool	meta::kIsStdHashable
template<typename T>
constexpr bool	meta::kIsSizable = kIsDetected<impl::IsSizable, T>
	Check if std::size is applicable to container.
template<typename T>
constexpr bool	meta::kIsReservable = kIsDetected<impl::ReserveResult, T>
	Check if a container has reserve
template<typename T>
constexpr bool	meta::kIsPushBackable = kIsDetected<impl::PushBackResult, T>
	Check if a container has 'push_back'.
template<typename T>
constexpr bool	meta::kIsFixedSizeContainer = impl::IsFixedSizeContainer<T>::value
	Check if a container has fixed size (e.g. std::array)

Typedef Documentation

MapKeyType

template<typename T>

using meta::MapKeyType = DetectedType<impl::KeyType, T>

Definition at line 106 of file meta.hpp.

MapValueType

template<typename T>

using meta::MapValueType = DetectedType<impl::MappedType, T>

Definition at line 109 of file meta.hpp.

RangeValueType

template<typename T>

using meta::RangeValueType = DetectedType<impl::RangeValueType, T>

Definition at line 112 of file meta.hpp.

Function Documentation

Inserter()

template<typename T>

auto meta::Inserter

(

T &

container

)

Returns default inserter for a container.

Definition at line 151 of file meta.hpp.

Variable Documentation

kIsEqualityComparable

template<typename T, typename U = T>

bool meta::kIsEqualityComparable = std::is_same_v<DetectedType<impl::EqualityComparisonResult, T, U>, bool>

inlineconstexpr

Definition at line 127 of file meta.hpp.

kIsFixedSizeContainer

template<typename T>

bool meta::kIsFixedSizeContainer = impl::IsFixedSizeContainer<T>::value

inlineconstexpr

Check if a container has fixed size (e.g. std::array)

Definition at line 147 of file meta.hpp.

kIsIterator

template<typename T>

bool meta::kIsIterator = impl::IsIterator<T>::value

inlineconstexpr

Definition at line 118 of file meta.hpp.

kIsMap

template<typename T>

bool meta::kIsMap

inlineconstexpr

Initial value:

=
    kIsDetected<impl::IsRange, T> && kIsDetected<impl::KeyType, T> && kIsDetected<impl::MappedType, T>

Returns true if T is an ordered or unordered map or multimap.

Definition at line 96 of file meta.hpp.

kIsOptional

template<typename T>

bool meta::kIsOptional = kIsInstantiationOf<std::optional, T>

inlineconstexpr

Definition at line 121 of file meta.hpp.

kIsOstreamWritable

template<typename T>

bool meta::kIsOstreamWritable = std::is_same_v<DetectedType<impl::OstreamWriteResult, T>, std::ostream&>

inlineconstexpr

Definition at line 124 of file meta.hpp.

kIsPushBackable

template<typename T>

bool meta::kIsPushBackable = kIsDetected<impl::PushBackResult, T>

inlineconstexpr

Check if a container has 'push_back'.

Definition at line 143 of file meta.hpp.

kIsRange

template<typename T>

bool meta::kIsRange = kIsDetected<impl::IsRange, T>

inlineconstexpr

Definition at line 92 of file meta.hpp.

kIsRecursiveRange

template<typename T>

bool meta::kIsRecursiveRange = std::is_same_v<DetectedType<impl::RangeValueType, T>, T>

inlineconstexpr

Definition at line 115 of file meta.hpp.

kIsReservable

template<typename T>

bool meta::kIsReservable = kIsDetected<impl::ReserveResult, T>

inlineconstexpr

Check if a container has reserve

Definition at line 139 of file meta.hpp.

kIsSizable

template<typename T>

bool meta::kIsSizable = kIsDetected<impl::IsSizable, T>

inlineconstexpr

Check if std::size is applicable to container.

Definition at line 135 of file meta.hpp.

kIsStdHashable

template<typename T>

bool meta::kIsStdHashable

inlineconstexpr

Initial value:

=
    std::is_same_v<DetectedType<impl::StdHashResult, T>, std::size_t> && kIsEqualityComparable<T>

Definition at line 130 of file meta.hpp.

kIsUniqueMap

template<typename T>

bool meta::kIsUniqueMap

inlineconstexpr

Initial value:

= kIsMap<T> && kIsDetected<
                                                      impl::SubscriptOperatorResult,
                                                      T>

Returns true if T is a map (but not a multimap!)

Definition at line 101 of file meta.hpp.

kIsVector

template<typename T>

bool meta::kIsVector = kIsInstantiationOf<std::vector, T>

inlineconstexpr

Definition at line 89 of file meta.hpp.