def compose_result(
self,
function: Callable[
[Result[_ValueType, _ErrorType]],
Kind3[
RequiresContextFutureResult,
_NewValueType,
_ErrorType,
_EnvType,
],
],
) -> RequiresContextFutureResult[_NewValueType, _ErrorType, _EnvType]:
"""
Composes inner ``Result`` with ``ReaderFutureResult`` returning func.
Can be useful when you need an access to both states of the result.
.. code:: python
>>> import anyio
>>> from returns.context import ReaderFutureResult, NoDeps
>>> from returns.io import IOSuccess, IOFailure
>>> from returns.result import Result
>>> def count(
... container: Result[int, int],
... ) -> ReaderFutureResult[int, int, NoDeps]:
... return ReaderFutureResult.from_result(
... container.map(lambda x: x + 1).alt(abs),
... )
>>> success = ReaderFutureResult.from_value(1)
>>> failure = ReaderFutureResult.from_failure(-1)
>>> assert anyio.run(
... success.compose_result(count), ReaderFutureResult.no_args,
... ) == IOSuccess(2)
>>> assert anyio.run(
... failure.compose_result(count), ReaderFutureResult.no_args,
... ) == IOFailure(1)
"""
return RequiresContextFutureResult(
lambda deps: FutureResult(
_reader_future_result.async_compose_result(
function, self, deps,
),
),
)
def bind_async(
self,
function: Callable[
[_ValueType],
Awaitable[
Kind3[
RequiresContextFutureResult,
_NewValueType,
_ErrorType,
_EnvType,
],
],
],
) -> RequiresContextFutureResult[_NewValueType, _ErrorType, _EnvType]:
"""
Composes this container with a async function returning the same type.
.. code:: python
>>> import anyio
>>> from returns.context import RequiresContextFutureResult
>>> from returns.io import IOSuccess, IOFailure
>>> async def function(
... number: int,
... ) -> RequiresContextFutureResult[str, int, int]:
... return RequiresContextFutureResult.from_value(number + 1)
>>> assert anyio.run(
... RequiresContextFutureResult.from_value(1).bind_async(
... function,
... ),
... RequiresContextFutureResult.no_args,
... ) == IOSuccess(2)
>>> assert anyio.run(
... RequiresContextFutureResult.from_failure(1).bind_async(
... function,
... ),
... RequiresContextFutureResult.no_args,
... ) == IOFailure(1)
"""
return RequiresContextFutureResult(
lambda deps: FutureResult(_reader_future_result.async_bind_async(
function, self, deps,
)),
)
