# Adobe PDF Library 18 C++ API Reference APDFL18.0.5PlusP2a

> The Adobe PDF Library C++ API provides low-level access to PDF document manipulation. The API is organized into functional layers, each containing related functions, definitions, and data types.

- Product: Adobe PDF Library 18
- Language: C++
- Version: APDFL18.0.5PlusP2a
- HTML page: https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a
- Version index: https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/llms.txt

The Adobe PDF Library C++ API provides low-level access to PDF document manipulation. The API is organized into functional layers, each containing related functions, definitions, and data types.

## Layers

- [Acro Support Layer](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/aslayer.md): 21 components, 716 items.
- [COS Layer](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/coslayer.md): 12 components, 137 items.
- [PD Layer](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/pdlayer.md): 47 components, 1090 items.
- [PDF Edit Layer](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/pdelayer.md): 37 components, 448 items.
- [PDSEdit Layer](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/pdslayer.md): 7 components, 134 items.
- [PDFL Library Layer](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/pdfllayer.md): 11 components, 164 items.
- [Acro Color Layer](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/acrocolor.md): 1 components, 102 items.
- [APDFL Plugins](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/plugins.md): 4 components, 109 items.
- [Forms Extension](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/formsextension.md): 2 components, 19 items.
- [Additional functionality from Datalogics](https://docs.datalogics.com/apdfl18/CPlusPlus/APDFL18.0.5PlusP2a/dlextras.md): 22 components, 201 items.