# LEF 5.8 C/C++ Programming Interface -- Preface
Describes the C/C++ programming interface used to read and write Library Exchange Format (LEF) files.
Author: Technical Publications

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LEF 5.8 C/C++ Programming Interface (Open Licensing Program)

# Preface

This document describes the C and C++ programming interface used to read and write Cadence® Library Exchange Format (LEF) files. You should be an experienced C++ or C programmer and be familiar with LEF file structure to read this manual.

## What's New

For information on what is new or changed in the LEF programming interface for version 5.8, see What's New in LEF C/C++ Programming Interface .

For information on what is new or changed in the DEF programming interface for version 5.8, see What's New in DEF C/C++ Programming Interface .

For information on what is new or changed in LEF and DEF for version 5.8, see What's New in LEF/DEF.

## Related Documents

The LEF C/C++ programming interface lets you create programs that read and write LEF files. For more information about the Design Exchange Format (DEF) file syntax, see the
LEF/DEF Language Reference.

## Typographic and Syntax Conventions

This list describes the conventions used in this manual.

text

> Words in monospace type indicate keywords that you must enter literally. These keywords represent language tokens.

variable

> Words in italics indicate user-defined information for which you must substitute a name or a value.

int

> Specifies an integer argument

num

> Some LEF classes can be defined more than once. A statement that begins with the identifier num represents a specific number of calls to the particular class type.

{ }

> Braces enclose each entire LEF class definition.

|

> Vertical bars separate possible choices for a single argument. They take precedence over any other character.

[ ]

> Brackets denote optional arguments. When used with vertical bars, they enclose a list of choices from which you can choose one.

4/12/17

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