本文档描述了对源代码进行操作的C++编程语言（第2条）的扩展。这些扩展包括新的语法形式和对现有语言语义的修改，以及对现有库设施的更改和添加。 修改或添加段落的说明以明确说明的形式编写。对ISO/IEC 14882:2020中现有文本的直接修改使用下划线表示添加的文本，删除线表示删除的文本。

This document describes extensions to the C++ Programming Language (Clause 2) that enable operations on source code. These extensions include new syntactic forms and modifications to existing language semantics, as well as changes and additions to the existing library facilities. Instructions to modify or add paragraphs are written as explicit instructions. Modifications made directly to existing text from ISO/IEC 14882:2020 use underlining to represent added text and strikethrough to represent deleted text.