move stdc++ checking code to is_stdcpp_enouch() function

play.d/common.sh

@@ -66,6 +66,25 @@ get_pkgvendor()
     epm print field Vendor for package $1
 }
 
+# arg: minimal require of libstdc++ version
+# return true is we have such version
+is_stdcpp_enough()
+{
+    local needed="$1"
+    local STDCPKG="libstdc++"
+    epm installed $STDCPKG || STDCPKG="libstdc++6"
+
+    if epm installed $STDCPKG ; then
+        local stdcver
+        stdcver=$(epm print version for package "$STDCPKG" | head -n1)
+        if [ -n "$stdcver" ] && [ "$(epm print compare version "$stdcver" "$needed")" = "-1" ] ; then
+            return 1
+        fi
+    fi
+    return 0
+}
+
+
 get_first()
 {
     echo "$1"

play.d/lycheeslicer.sh

@@ -15,16 +15,7 @@ case "$(epm print info -s)" in
         ;;
 esac
 
-STDCPKG="libstdc++"
-epm installed $STDCPKG || STDCPKG="libstdc++6"
-
-if epm installed $STDCPKG ; then
-    stdcver=$(epm print version for package "$STDCPKG" | head -n1)
-    if [ -n "$stdcver" ] && [ "$(epm print compare version "$stdcver" "11.0")" = "-1" ] ; then
-           # all next versions require libstdc++ >= 11 (libstdc++.so.6(GLIBCXX_3.4.29)(64bit))
-           VERSION="4.1.0"
-    fi
-fi
+is_stdcpp_enough "11.0" || VERSION="4.1.0"
 
 PKGURL="$(eget --list --latest https://mango3d.io/downloads/ "LycheeSlicer-$VERSION.deb")"