[requirements.general]

# 16 Library introduction [[library]](./#library)

## 16.4 Library-wide requirements [[requirements]](requirements#general)

### 16.4.1 General [requirements.general]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L1087)

Subclause [[requirements]](requirements "16.4 Library-wide requirements") specifies requirements that apply to the entire C++ standard library[.](#1.sentence-1)

[[support]](support "17 Language support library") through [[exec]](exec "33 Execution control library") and [[depr]](depr "Annex D (normative) Compatibility features") specify the requirements of individual entities within the library[.](#1.sentence-2)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L1092)

Requirements specified in terms of interactions between threads do not apply to
programs having only a single thread of execution[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L1096)

[[organization]](organization "16.4.2 Library contents and organization") describes the library's contents and
organization, [[using]](using "16.4.3 Using the library") describes how well-formed C++ programs gain access to library
entities,[[utility.requirements]](utility.requirements "16.4.4 Requirements on types and expressions") describes constraints on types and functions used with
the C++ standard library,[[constraints]](constraints "16.4.5 Constraints on programs") describes constraints on well-formed C++ programs, and[[conforming]](conforming "16.4.6 Conforming implementations") describes constraints on conforming implementations[.](#3.sentence-1)