// 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
}

from fastapi import APIRouter

router = APIRouter()


@router.get("/users/", tags=["users"])
async def read_users():
    return [{"username": "Rick"}, {"username": "Morty"}]


@router.get("/users/me", tags=["users"])
async def read_user_me():
    return {"username": "fakecurrentuser"}


@router.get("/users/{username}", tags=["users"])
async def read_user(username: str):

client = TestClient(app)


def test_get_portal():
    response = client.get("/teleport", follow_redirects=False)
    assert response.status_code == 307, response.text
    assert response.headers["location"] == "https://www.youtube.com/watch?v=dQw4w9WgXcQ"


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {

    return dep


@app.get("/directCookie")
def get_direct_cookie(dep: str = Depends(set_cookie)):
    return {"dep": dep}


@app.get("/indirectCookie")
def get_indirect_cookie(dep: str = Depends(set_indirect_cookie)):
    return {"dep": dep}


client = TestClient(app)


def test_cookie_is_set_once():
    direct_response = client.get("/directCookie")

                return (com.google.inject.Key<U>) com.google.inject.Key.get(key.getType(), Names.named(s));
            } else if (key.getQualifier() instanceof Annotation a) {
                return (com.google.inject.Key<U>) com.google.inject.Key.get(key.getType(), a);
            } else {
                return (com.google.inject.Key<U>) com.google.inject.Key.get(key.getType());
            }
        }

    }
)

client = TestClient(app)


@app.get("/http-exception")
def route_with_http_exception():
    raise HTTPException(status_code=400)


@app.get("/request-validation/{param}/")
def route_with_request_validation_exception(param: int):
    pass  # pragma: no cover


@app.get("/server-error")
def route_with_server_error():
    raise RuntimeError("Oops!")

import org.gradle.kotlin.dsl.*


internal
val CtClass.isKotlin: Boolean
    get() = hasAnnotation(Metadata::class.qualifiedName)


internal
val CtMethod.isSynthetic
    get() = methodInfo.getAttribute(SyntheticAttribute.tag) != null


internal
val MemberValue.intValue: Int
    get() {
        var value: Int? = null
        accept(object : MemberValueVisitorAdapter() {

app = FastAPI()


@app.get("/", openapi_extra={"x-custom-extension": "value"})
def route_with_extras():
    return {}


client = TestClient(app)


def test_get_route():
    response = client.get("/")
    assert response.status_code == 200, response.text
    assert response.json() == {}


def test_openapi():
    response = client.get("/openapi.json")

   * same result.
   */
  enum CollectStrategy {
    /** Get one accumulator and accumulate the elements into it sequentially. */
    SEQUENTIAL {
      @Override
      final <T extends @Nullable Object, A extends @Nullable Object, R extends @Nullable Object>
          A result(Collector<T, A, R> collector, Iterable<T> inputs) {
        A accum = collector.supplier().get();
        for (T input : inputs) {

from docs_src.handling_errors.tutorial003 import app

client = TestClient(app)


def test_get():
    response = client.get("/unicorns/shinny")
    assert response.status_code == 200, response.text
    assert response.json() == {"unicorn_name": "shinny"}


def test_get_exception():
    response = client.get("/unicorns/yolo")
    assert response.status_code == 418, response.text
    assert response.json() == {