Collection<F> fromCollection, Function<? super F, T> function) {
    return new TransformedCollection<>(fromCollection, function);
  }

  private static final class TransformedCollection<
          F extends @Nullable Object, T extends @Nullable Object>
      extends AbstractCollection<T> {
    final Collection<F> fromCollection;
    final Function<? super F, ? extends T> function;

# Get Current User { #get-current-user }

In the previous chapter the security system (which is based on the dependency injection system) was giving the *path operation function* a `token` as a `str`:

{* ../../docs_src/security/tutorial001_an_py39.py hl[12] *}

But that is still not that useful.

Let's make it give us the current user.

## Create a user model { #create-a-user-model }

First, let's create a Pydantic user model.

	exit 1
fi

trap 'catch $LINENO' ERR

function purge() {
	rm -rf "$1"
}

# shellcheck disable=SC2120
catch() {
	if [ $# -ne 0 ]; then
		echo "error on line $1"
	fi

	echo "Cleaning up instances of MinIO"
	pkill minio || true
	pkill -9 minio || true
	purge "$WORK_DIR"
	if [ $# -ne 0 ]; then
		exit $#
	fi
}

catch

function start_minio_10drive() {
	start_port=$1

        assertTrue(msgs.length >= 3, "Expect at least the first 3 entries present");
        assertEquals("The operation completed successfully.", msgs[0]);
        assertEquals("Incorrect function.", msgs[1]);
        assertEquals("Incorrect function.", msgs[2]);
    }

    @Test
    @DisplayName("Messages: accessing invalid index throws ArrayIndexOutOfBoundsException")
    void messagesOutOfBoundsThrows() {
        // Arrange

import static com.google.common.truth.Truth.assertThat;

import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.collect.testing.MapInterfaceTest;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

import kotlin.annotation.AnnotationRetention.BINARY
import kotlin.annotation.AnnotationTarget.CLASS
import kotlin.annotation.AnnotationTarget.CONSTRUCTOR
import kotlin.annotation.AnnotationTarget.FUNCTION

@Retention(BINARY)
@Documented
@Target(CONSTRUCTOR, CLASS, FUNCTION)

	PHYS_DIR=$(pwd -P)
	RESULT=$PHYS_DIR/$TARGET_FILE
	echo $RESULT
}

## FIXME:
## In OSX, 'sort -V' option does not exist, hence
## we have our own version compare function.
## Once OSX has the option, below function is good enough.
##
## check_minimum_version() {
##     versions=($(echo -e "$1\n$2" | sort -V))
##     return [ "$1" == "${versions[0]}" ]
## }
##
check_minimum_version() {

        assertEquals(smbComNtTransaction.setupCount, dst[35], "setupCount should be written correctly");
        assertEquals(smbComNtTransaction.function, SmbComTransaction.readInt2(dst, 36), "function should be written correctly");
    }

    @Test
    void testWriteParameterWordsWireFormat_SecondaryTransaction() {
        // Test the writeParameterWordsWireFormat for a secondary transaction.

### Other utility functions { #other-utility-functions }

Any other utility function that you call directly can be created with normal `def` or `async def` and FastAPI won't affect the way you call it.

This is in contrast to the functions that FastAPI calls for you: *path operation functions* and dependencies.

   */
  fun <T : Any> tag(
    type: KClass<T>,
    computeIfAbsent: () -> T,
  ): T

  /**
   * Returns the tag attached with [type] as a key. If it is absent, then [computeIfAbsent] is
   * called and that value is both inserted and returned.
   *
   * If multiple calls to this function are made concurrently with the same [type], multiple values