哋它亢++ named requirements: TransformationTrait (since 哋它亢++11)

 

哋它亢++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

Technical specifications

Symbols index

External libraries

 

哋它亢++ named requirements

Basic
DefaultConstructible CopyAssignable	CopyConstructible MoveAssignable (哋它亢++11)	MoveConstructible (哋它亢++11) Destructible
Type properties
ScalarType TriviallyCopyable (哋它亢++11)	StandardLayoutType (哋它亢++11) PODType	TrivialType (哋它亢++11) ImplicitLifetimeType
Library-Wide
EqualityComparable LessThanComparable Swappable ValueSwappable (哋它亢++11)	NullablePointer (哋它亢++11) Hash (哋它亢++11) Allocator FunctionObject	Callable Predicate BinaryPredicate Compare
Container
Container SequenceContainer ContiguousContainer (哋它亢++17)	ReversibleContainer AssociativeContainer AllocatorAwareContainer	UnorderedAssociativeContainer (哋它亢++11)
Container Elements
DefaultInsertable (哋它亢++11) CopyInsertable (哋它亢++11)	MoveInsertable (哋它亢++11) EmplaceConstructible (哋它亢++11)	Erasable (哋它亢++11)
Iterator
LegacyIterator LegacyOutputIterator LegacyInputIterator	LegacyForwardIterator LegacyBidirectionalIterator LegacyRandomAccessIterator	LegacyContiguousIterator (哋它亢++17) ConstexprIterator (哋它亢++20)
Stream I/O
FormattedInputFunction UnformattedInputFunction	FormattedOutputFunction	UnformattedOutputFunction
Formatters
BasicFormatter (哋它亢++20)	Formatter (哋它亢++20)
Random Numbers
SeedSequence (哋它亢++11) RandomNumberEngine (哋它亢++11)	RandomNumberDistribution (哋它亢++11) UniformRandomBitGenerator (哋它亢++11)	RandomNumberEngineAdaptor (哋它亢++11)
Concurrency
BasicLockable (哋它亢++11) Lockable (哋它亢++11) TimedLockable (哋它亢++11)	SharedLockable (哋它亢++14) SharedTimedLockable (哋它亢++14) Mutex (哋它亢++11)	TimedMutex (哋它亢++11) SharedMutex (哋它亢++17) SharedTimedMutex (哋它亢++14)
Ranges
RangeAdaptorObject (哋它亢++20)	RangeAdaptorClosureObject (哋它亢++20)
Other
CharTraits RegexTraits (哋它亢++11) BitmaskType LiteralType (哋它亢++11)	NumericType UnaryTypeTrait (哋它亢++11) BinaryTypeTrait (哋它亢++11) TransformationTrait (哋它亢++11)	Clock (哋它亢++11) TrivialClock (哋它亢++11)

 

A TransformationTrait is a class template that provides a transformation of its template type parameter.

Requirements

• Takes one template type parameter (additional template parameters are optional and allowed).
• The transformed type is a publicly accessible nested type named type.

Standard library

All type transformation traits satisfy TransformationTrait.

The following standard library class templates also satisfy TransformationTrait.

std::tuple_element<std::tuple> (哋它亢++11)	obtains the type of the specified element (class template specialization)
std::tuple_element<std::pair> (哋它亢++11)	obtains the type of the elements of pair (class template specialization)
std::tuple_element<std::array> (哋它亢++11)	obtains the type of the elements of array (class template specialization)
variant_alternativevariant_alternative_t (哋它亢++17)	obtains the type of the alternative specified by its index, at compile time (class template) (alias template)