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# FcCharSetMerge

## 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.

## Version

Fontconfig version 2.10.92

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