[macro.names]

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

## 16.4 Library-wide requirements [[requirements]](requirements#macro.names)

### 16.4.5 Constraints on programs [[constraints]](constraints#macro.names)

#### 16.4.5.3 Reserved names [[reserved.names]](reserved.names#macro.names)

#### 16.4.5.3.3 Macro names [macro.names]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3282)

A translation unit that includes a standard library header shall not#define or #undef names declared in any standard
library header[.](#1.sentence-1)