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Implement RFC 15: Lifting shape-castable objects.

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See amaranth-lang/rfcs#15 and #784.

Note that this RFC breaks the existing syntax for initializing a view
with a new signal. Instances of `View(layout)` *must* be changed to
`Signal(layout)`.
This commit is contained in:
Catherine 2023-05-13 01:16:28 +00:00
parent 8af90620c0
commit 52b9d3f799
1 changed files with 1 additions and 4 deletions
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5
amaranth/lib/data.py
View file

@ -587,10 +587,7 @@ class View(ValueCastable):
Creating a view
###############
When creating a view, either only the ``target`` argument, or any of the ``name``, ``reset``,
``reset_less``, ``attrs``, or ``decoder`` arguments may be provided. If a target is provided,
it is used as the underlying value. Otherwise, a new :class:`Signal` is created, and the rest
of the arguments are passed to its constructor.
A view must be created using an explicitly provided layout and target. To create a new :class:`Signal` that is wrapped in a :class:`View` with a given ``layout``, use ``Signal(layout, ...)``, which for a :class:`Layout` is equivalent to ``View(layout, Signal(...))``.
Accessing a view
################