C++ named requirements: BinaryTypeTrait (since C++11)

 

C++

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Freestanding and hosted

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Standard library headers

Named requirements

Feature test macros (C++20)

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Concepts library (C++20)

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Technical specifications

Symbols index

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C++ named requirements

Basic DefaultConstructible MoveConstructible (C++11) CopyConstructible CopyAssignable MoveAssignable (C++11) Destructible Type properties ScalarType PODType TriviallyCopyable (C++11) TrivialType (C++11) StandardLayoutType (C++11)   ImplicitLifetimeType Library-wide BooleanTestable EqualityComparable LessThanComparable Swappable ValueSwappable (C++11) NullablePointer (C++11) Hash (C++11) Allocator FunctionObject Callable Predicate BinaryPredicate Compare

Container Container ReversibleContainer AllocatorAwareContainer SequenceContainer ContiguousContainer (C++17) AssociativeContainer UnorderedAssociativeContainer (C++11)   Container element DefaultInsertable (C++11) CopyInsertable (C++11) MoveInsertable (C++11) EmplaceConstructible (C++11) Erasable (C++11) Iterator LegacyIterator LegacyInputIterator LegacyOutputIterator LegacyForwardIterator LegacyBidirectionalIterator LegacyRandomAccessIterator LegacyContiguousIterator (C++17) ConstexprIterator (C++20) Stream I/O FormattedInputFunction UnformattedInputFunction FormattedOutputFunction UnformattedOutputFunction Formatters BasicFormatter (C++20) Formatter (C++20)

Random Numbers SeedSequence (C++11) RandomNumberEngine (C++11) RandomNumberDistribution (C++11) UniformRandomBitGenerator (C++11) RandomNumberEngineAdaptor (C++11) Concurrency BasicLockable (C++11) Lockable (C++11) TimedLockable (C++11) SharedLockable (C++14) SharedTimedLockable (C++14) Mutex (C++11) TimedMutex (C++11) SharedMutex (C++17) SharedTimedMutex (C++14) Ranges RangeAdaptorObject (C++20) RangeAdaptorClosureObject (C++20) Multidimensional View LayoutMapping (C++23) LayoutMappingPolicy (C++23) AccessorPolicy (C++23) Other CharTraits RegexTraits (C++11)   BitmaskType LiteralType (C++11) NumericType UnaryTypeTrait (C++11) BinaryTypeTrait (C++11) TransformationTrait (C++11) Clock (C++11) TrivialClock (C++11)

 

A BinaryTypeTrait is a class template that describes a relationship between its two template type parameters with a std::integral_constant (typically std::bool_constant) specialization.

Requirements

• DefaultConstructible and CopyConstructible.
• Takes two template type parameters (additional template parameters are optional and allowed).
• Publicly and unambiguously derived from a specialization of std::integral_constant, known as its base characteristic.
• The member names of the base characteristic are not hidden and are unambiguously available.

Standard library

The following standard library class templates satisfy BinaryTypeTrait:

is_same (C++11)	checks if two types are the same (class template)
is_base_of (C++11)	checks if a type is a base of the other type (class template)
is_virtual_base_of (C++26)	checks if a type is a virtual base of the other type (class template)
is_convertibleis_nothrow_convertible (C++11)(C++20)	checks if a type can be converted to the other type (class template)
is_layout_compatible (C++20)	checks if two types are layout-compatible (class template)
is_pointer_interconvertible_base_of (C++20)	checks if a type is a pointer-interconvertible (initial) base of another type (class template)
is_invocableis_invocable_ris_nothrow_invocableis_nothrow_invocable_r (C++17)	checks if a type can be invoked (as if by std::invoke) with the given argument types (class template)
uses_allocator (C++11)	checks if the specified type supports uses-allocator construction (class template)