[organization.general] # 16 Library introduction [[library]](./#library) ## 16.4 Library-wide requirements [[requirements]](requirements#organization.general) ### 16.4.2 Library contents and organization [[organization]](organization#general) #### 16.4.2.1 General [organization.general] [1](#1) [#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L1109) [[contents]](contents "16.4.2.2 Library contents") describes the entities and macros defined in the C++ standard library[.](#1.sentence-1) [[headers]](headers "16.4.2.3 Headers") lists the standard library headers and some constraints on those headers[.](#1.sentence-2) [[compliance]](compliance "16.4.2.5 Freestanding implementations") lists requirements for a freestanding implementation of the C++ standard library[.](#1.sentence-3)