package once

// Singleton contains a pointer to T that must be set once.
// Until the value is set all Get() calls will block.
type Singleton[T any] struct {
	v   *T
	set chan struct{}
}

// NewSingleton creates a new unset singleton.
func NewSingleton[T any]() *Singleton[T] {
	return &Singleton[T]{set: make(chan struct{}), v: nil}
}

// Get will return the singleton value.
func (s *Singleton[T]) Get() *T {
	<-s.set
	return s.v
}

                // do nothing
                break;
            default:
                throw new IllegalArgumentException(
                        "build.snapshot was set to [" + buildSnapshotSystemProperty + "] but can only be unset or [true|false]");
        }
        loadedProps.put("elasticsearch", elasticsearch);
    }

forceflag=""
if [ "$1" = "-force" ]; then
	forceflag=-force
	shift
fi

targ="../../go-${GOOS}-${GOARCH}-bootstrap"
if [ -e $targ ]; then
	echo "$targ already exists; remove before continuing"
	exit 2
fi

unset GOROOT
src=$(cd .. && pwd)
echo "#### Copying to $targ"
cp -Rp "$src" "$targ"
cd "$targ"
echo
echo "#### Cleaning $targ"
chmod -R +w .
rm -f .gitignore
if [ -e .git ]; then
	git clean -f -d
fi
echo

	fi
}

catch

function start_minio_10drive() {
	start_port=$1

	export MINIO_ROOT_USER=minio
	export MINIO_ROOT_PASSWORD=minio123
	export MC_HOST_minio="http://minio:minio123@127.0.0.1:${start_port}/"
	unset MINIO_KMS_AUTO_ENCRYPTION # do not auto-encrypt objects
	export MINIO_CI_CD=1

	mkdir ${WORK_DIR}
	C_PWD=${PWD}
	if [ ! -x "$PWD/mc" ]; then
		MC_BUILD_DIR="mc-$RANDOM"

	fi
}

function verify_rewrite() {
	start_port=$1

	export MINIO_ACCESS_KEY=minio
	export MINIO_SECRET_KEY=minio123
	export MC_HOST_minio="http://minio:minio123@127.0.0.1:${start_port}/"
	unset MINIO_KMS_AUTO_ENCRYPTION # do not auto-encrypt objects
	export MINIO_CI_CD=1

	MC_BUILD_DIR="mc-$RANDOM"
	if ! git clone --quiet https://github.com/minio/mc "$MC_BUILD_DIR"; then

	}
	sort.Ints(props.PoolNumbers)
	props.PoolNumber = func() int {
		if len(props.PoolNumbers) == 1 {
			return props.PoolNumbers[0]
		}
		return math.MaxInt // this indicates that its unset.
	}()

	sensitive := map[string]struct{}{
		config.EnvAccessKey:         {},
		config.EnvSecretKey:         {},
		config.EnvRootUser:          {},
		config.EnvRootPassword:      {},

{* ../../docs_src/security/tutorial002_an_py310.py hl[25] *}

## Den Benutzer abrufen { #get-the-user }

`get_current_user` wird eine von uns erstellte (gefakte) Hilfsfunktion verwenden, welche einen Token vom Typ `str` entgegennimmt und unser Pydantic-`User`-Modell zurückgibt:

{* ../../docs_src/security/tutorial002_an_py310.py hl[19:22,26:27] *}

## Den aktuellen Benutzer einfügen { #inject-the-current-user }

     */
    public boolean isFlagSet(final int flag) {
        return (flags & flag) == flag;
    }

    /**
     * Unsets a specific flag
     * @param flag the flag to unset
     */
    public void unsetFlag(final int flag) {
        flags &= ~flag;
    }

    /**
     * Sets a specific flag
     * @param flag the flag to set
     */
    public void setFlag(final int flag) {

        TestMessage m = new TestMessage();
        int FLAG_A = 0x01;
        int FLAG_B = 0x02;
        assertFalse(m.isFlagSet(FLAG_A));
        m.setFlag(FLAG_A);
        assertTrue(m.isFlagSet(FLAG_A));
        // unset correctly removes the flag
        m.unsetFlag(FLAG_A);
        assertFalse(m.isFlagSet(FLAG_A));
        // Test another flag
        m.setFlag(FLAG_B);
        assertTrue(m.isFlagSet(FLAG_B));

Mais ce guide vous montre, plus ou moins, la façon dont ils sont censés être utilisés.

///

### Utiliser le paramètre `exclude_unset` de Pydantic { #using-pydantics-exclude-unset-parameter }

Si vous souhaitez recevoir des mises à jour partielles, il est très utile d’utiliser le paramètre `exclude_unset` dans la méthode `.model_dump()` du modèle Pydantic.

Comme `item.model_dump(exclude_unset=True)`.