Provided by: libfontconfig1-dev_2.11.94-0ubuntu1.1_amd64 

NAME
FcCharSetMerge - Merge charsets
SYNOPSIS
#include <fontconfig/fontconfig.h>
FcBool FcCharSetMerge (FcCharSet *a, const FcCharSet *b, FcBool *changed);
DESCRIPTION
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 2.11.94 02 6月 2015 FcCharSetMerge(3)