► |  | Reference: PLT Scheme

1 | Language Model
2 | Syntactic Forms
3 | Datatypes
4 | Structures
5 | Classes and Objects
6 | Units
7 | Contracts
8 | Pattern Matching
9 | Control Flow
10 | Concurrency
11 | Macros
12 | Input and Output
13 | Reflection and Security
14 | Operating System
15 | Memory Management
16 | Unsafe Operations
17 | Running PLT Scheme
| Bibliography
| Index

► | 12 | Input and Output

12.1 | Ports
12.2 | Byte and String Input
12.3 | Byte and String Output
12.4 | Reading
12.5 | Writing
12.6 | The Reader
12.7 | The Printer
12.8 | Pretty Printing
12.9 | Reader Extension
12.10 | Printer Extension
12.11 | Serialization

▼ | 12.9 | Reader Extension

12.9.1 | Readtables
12.9.2 | Reader-Extension Procedures
12.9.3 | Special Comments

On this page:

make-special-comment
special-comment?
special-comment-value

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##### 12.9.3`` Special Comments

(make-special-comment v) → special-comment?
v : any/c

Creates a special-comment value that encapsulates v. The read, read-syntax, etc. procedures treat values constructed with make-special-comment as delimiting whitespace when returned by a reader-extension procedure (see Reader-Extension Procedures).

(special-comment? v) → boolean?
v : any/c

Returns #t if v is the result of make-special-comment, #f otherwise.

(special-comment-value sc) → any
sc : special-comment?

Returns the value encapsulated by the special-comment value sc. This value is never used directly by a reader, but it might be used by the context of a read-char-or-special, etc. call that detects a special comment.
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