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ranges::relation Concept Reference
Functional

The `relation` concept. More...

`#include <range/v3/functional/concepts.hpp>`

## Concept definition

template<typename R, typename T, typename U>
concept ranges::relation =
predicate<R, T, T> &&
predicate<R, U, U> &&
predicate<R, T, U> &&
predicate<R, U, T>
ranges::predicate
The predicate concept.
Definition concepts.hpp:73
ranges::relation
The relation concept.
Definition concepts.hpp:80

## Detailed Description

The `relation` concept.