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#  Named Requirements

From cppreference.com

< [ cpp ](/w/cpp "cpp")

[ C++ ](/w/cpp "cpp")

[ Compiler support ](/w/cpp/compiler_support "cpp/compiler support")  
---  
[ Freestanding and hosted ](/w/cpp/freestanding "cpp/freestanding")  
[ Language ](/w/cpp/language "cpp/language")  
[ Standard library ](/w/cpp/standard_library "cpp/standard library")  
[ Standard library headers ](/w/cpp/header "cpp/header")  
**Named requirements**  
[ Feature test macros ](/w/cpp/feature_test "cpp/feature test") (C++20)  
[ Language support library ](/w/cpp/utility#Language_support "cpp/utility")  
[ Concepts library ](/w/cpp/concepts "cpp/concepts") (C++20)  
[ Metaprogramming library ](/w/cpp/meta "cpp/meta") (C++11)  
[ Diagnostics library ](/w/cpp/error "cpp/error")  
[ General utilities library ](/w/cpp/utility "cpp/utility")  
[ Strings library ](/w/cpp/string "cpp/string")  
[ Containers library ](/w/cpp/container "cpp/container")  
[ Iterators library ](/w/cpp/iterator "cpp/iterator")  
[ Ranges library ](/w/cpp/ranges "cpp/ranges") (C++20)  
[ Algorithms library ](/w/cpp/algorithm "cpp/algorithm")  
[ Numerics library ](/w/cpp/numeric "cpp/numeric")  
[ Localizations library ](/w/cpp/locale "cpp/locale")  
[ Input/output library ](/w/cpp/io "cpp/io")  
[ Filesystem library ](/w/cpp/filesystem "cpp/filesystem") (C++17)  
[ Regular expressions library ](/w/cpp/regex "cpp/regex") (C++11)  
[ Concurrency support library ](/w/cpp/thread "cpp/thread") (C++11)  
[ Technical specifications ](/w/cpp/experimental "cpp/experimental")  
[ Symbols index ](/w/cpp/symbol_index "cpp/symbol index")  
[ External libraries ](/w/cpp/links/libs "cpp/links/libs")  
  
[ [edit]
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**C++ named requirements**

[ Basic ](/w/cpp/named_req#Basic "cpp/named req")  
---  
|  [ DefaultConstructible  ](/w/cpp/named_req/DefaultConstructible "cpp/named
req/DefaultConstructible")  
---  
[ CopyAssignable  ](/w/cpp/named_req/CopyAssignable "cpp/named
req/CopyAssignable")  
  
|  [ CopyConstructible  ](/w/cpp/named_req/CopyConstructible "cpp/named
req/CopyConstructible")  
---  
[ MoveAssignable  ](/w/cpp/named_req/MoveAssignable "cpp/named
req/MoveAssignable") (C++11)  
  
|  [ MoveConstructible  ](/w/cpp/named_req/MoveConstructible "cpp/named
req/MoveConstructible") (C++11)  
---  
[ Destructible  ](/w/cpp/named_req/Destructible "cpp/named req/Destructible")  
  
[ Type properties ](/w/cpp/named_req#Type_properties "cpp/named req")  
|  [ ScalarType  ](/w/cpp/named_req/ScalarType "cpp/named req/ScalarType")  
---  
[ TriviallyCopyable  ](/w/cpp/named_req/TriviallyCopyable "cpp/named
req/TriviallyCopyable") (C++11)  
  
|  [ StandardLayoutType  ](/w/cpp/named_req/StandardLayoutType "cpp/named
req/StandardLayoutType") (C++11)  
---  
[ PODType  ](/w/cpp/named_req/PODType "cpp/named req/PODType")  
  
|  [ TrivialType  ](/w/cpp/named_req/TrivialType "cpp/named req/TrivialType")
(C++11)  
---  
[ ImplicitLifetimeType  ](/w/cpp/named_req/ImplicitLifetimeType "cpp/named
req/ImplicitLifetimeType")  
  
[ Library-Wide ](/w/cpp/named_req#Library-wide "cpp/named req")  
|  [ EqualityComparable  ](/w/cpp/named_req/EqualityComparable "cpp/named
req/EqualityComparable")  
---  
[ LessThanComparable  ](/w/cpp/named_req/LessThanCompara