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CentOS 7.0 - man page for fccharsetmerge (centos section 3)

FcCharSetMerge(3)														 FcCharSetMerge(3)

FcCharSetMerge - Merge charsets
#include <fontconfig/fontconfig.h> FcBool FcCharSetMerge (FcCharSet *a, const FcCharSet *b, FcBool *changed);
Adds all chars in b to a. In other words, this is an in-place version of FcCharSetUnion. If changed is not NULL, then it returns whether any new chars from b were added to a. Returns FcFalse on failure, either when a is a constant set or from running out of memory.
Fontconfig version 2.10.95 31 8 2013 FcCharSetMerge(3)