n   
(concept)  [ [edit]
](https://en.cppreference.com/mwiki/index.php?title=Template:cpp/concepts/dsc_relation&action=edit)  
[ equivalence_relation  ](/w/cpp/concepts/equivalence_relation "cpp/concepts/equivalence relation") (C++20)  |  specifies that a [ ` relation ` ](/w/cpp/concepts/relation "cpp/concepts/relation") imposes an equivalence relation   
(concept)  [ [edit]
](https://en.cppreference.com/mwiki/index.php?title=Template:cpp/concepts/dsc_equivalence_relation&action=edit)  
[ strict_weak_order  ](/w/cpp/concepts/strict_weak_order "cpp/concepts/strict weak order") (C++20)  |  specifies that a [ ` relation ` ](/w/cpp/concepts/relation "cpp/concepts/relation") imposes a strict weak ordering   
(concept)  [ [edit]
](https://en.cppreference.com/mwiki/index.php?title=Template:cpp/concepts/dsc_strict_weak_order&action=edit)  
  
Additional concepts can be found in [ the iterators library
](/w/cpp/iterator#C.2B.2B20_iterator_concepts "cpp/iterator") , [ the
algorithms library ](/w/cpp/iterator#Algorithm_concepts_and_utilities
"cpp/iterator") , and [ the ranges library ](/w/cpp/ranges#Range_concepts
"cpp/ranges") .

###  [ [ edit ](/mwiki/index.php?title=cpp/concepts&action=edit&section=4
"Edit section: See also") ]  See also

  * [ Named Requirements ](/w/cpp/named_req "cpp/named req")

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