# std::indirectly_swappable

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< cpp‎ | iterator

Defined in header `<iterator>` |  |
template< class I1, class I2 = I1 > concept indirectly_swappable = std::indirectly_readable <I1> && std::indirectly_readable <I2> && requires( const I1 i1, const I2 i2 ) { ranges::iter_swap (i1, i1); ranges::iter_swap (i1, i2); ranges::iter_swap (i2, i1); ranges::iter_swap (i2, i2); }; |  | (since C++20)

The concept `indirectly_swappable` specifies a relationship between two types respectively modelling std::indirectly_readable, where their referenced types can be swapped.

### Semantic requirements

`I1` and `I2` model `indirectly_swappable` only if all concepts it subsumes are modeled.

### Equality preservation

Expressions declared in requires expressions of the standard library concepts are required to be equality-preserving (except where stated otherwise).

### See also

indirectly_readable (C++20) | specifies that a type is indirectly readable by applying operator `*` (concept)
iter_swap (C++20) | swaps the values referenced by two dereferenceable objects (customization point object)

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