std::experimental::ranges::Swappable, std::experimental::ranges::SwappableWith

 

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Concepts library

Core language concepts
Same DerivedFrom ConvertibleTo	CommonReference Common	Integral SignedIntegral UnsignedIntegral	Assignable SwappableSwappableWith
Object concepts
Destructible Constructible DefaultConstructible	MoveConstructible CopyConstructible	Movable Copyable	Semiregular Regular
Comparison concepts
Boolean	WeaklyEqualityComparableWith	EqualityComparableEqualityComparableWith	StrictTotallyOrderedStrictTotallyOrderedWith
Callable concepts
InvocableRegularInvocable	Predicate	Relation	StrictWeakOrder
URNG concept
UniformRandomNumberGenerator

 

Defined in header <experimental/ranges/concepts>
template< class T > concept bool Swappable =     requires(T& a, T& b) {         ranges::swap(a, b);     };	(1)	(ranges TS)
template< class T, class U > concept bool SwappableWith =     CommonReference<         const std::remove_reference_t<T>&,         const std::remove_reference_t<U>&> &&     requires(T&& t, U&& u) {         ranges::swap(std::forward<T>(t), std::forward<T>(t));         ranges::swap(std::forward<U>(u), std::forward<U>(u));         ranges::swap(std::forward<T>(t), std::forward<U>(u));         ranges::swap(std::forward<U>(u), std::forward<T>(t));     };	(2)	(ranges TS)

The concept Swappable<T> specifies that lvalues of type T are swappable.

The concept SwappableWith<T, U> specifies that expressions of the type and value category encoded by T and U are swappable with each other. SwappableWith<T, U> is satisfied only if a call to ranges::swap(u, t), t2 is equal to u and u2 is equal to t.

Equality preservation

An expression is equality preserving if it results in equal outputs given equal inputs.

• The inputs to an expression consist of its operands.
• The outputs of an expression consist of its result and all operands modified by the expression (if any).

Every expression required to be equality preserving is further required to be stable: two evaluations of such an expression with the same input objects must have equal outputs absent any explicit intervening modification of those input objects.

Unless noted otherwise, every expression used in a requires-expression is required to be equality preserving and stable, and the evaluation of the expression may only modify its non-constant operands. Operands that are constant must not be modified.

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