---
name: "FcCharSetIsSubset"
section: "3"
platform: "linux"
package: "fontconfig"
version: "2:2.18.3-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/FcCharSetIsSubset"
---

# FcCharSetIsSubset(3)

Test for charset inclusion

## NAME

FcCharSetIsSubset - Test for charset inclusion

## SYNOPSIS

**#include \<fontconfig/fontconfig.h\>**

**FcBool FcCharSetIsSubset (const FcCharSet \****a***, const FcCharSet \****b***);**

## DESCRIPTION

Returns whether *a* is a subset of *b*.