Warning: This is the manual of the legacy Guile 2.2 series. You may want to read the manual of the current stable series instead.

6.23.2.1 Feature Manipulation

To check whether a particular feature is available, use the provided? procedure:

Scheme Procedure: provided? feature

Deprecated Scheme Procedure: feature? feature

Return #t if the specified feature is available, otherwise #f.

To advertise a feature from your own Scheme code, you can use the provide procedure:

Scheme Procedure: provide feature

Add feature to the list of available features in this Guile process.

For C code, the equivalent function takes its feature name as a char * argument for convenience:

C Function: void scm_add_feature (const char *str)

Add a symbol with name str to the list of available features in this Guile process.