boost::regex (implementation question)

From: John Emmas (john_at_[hidden])
Date: 2019-11-23 09:14:22

Yesterday I downloaded boost v1.71.0

The file 'regex/v4/cregex.hpp' contains declarations for functions like 
'regexecA' and 'regexecW'.  There are similar declarations for regfree, 
regcomp & regerror.

But where are the implementations for those functions?  Or is my own app 
expected to provide them?  Many thanks,

John Emmas