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10.17.2 Conversion

General definitions

bool to_boolean (SCM b)

Return true if b is SCM_BOOL_T, else return false.

This should be used instead of scm_is_true and scm_is_false for properties since empty lists are sometimes used to unset them.

[C type] ly_scm2[C type] (SCM s)

Behave the same as scm_to_[C type] would do if it existed.

[C type] robust_scm2[C type] (SCM s, [C type] d)

Behave the same as scm_to_[C type] would do if it existed. Return d if type verification fails.