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@__copy_capture
Deprecated
The @__copy_capture decorator is deprecated and will be removed in a future
release. Use the current closure syntax
with capture lists.
You can add the @__copy_capture decorator on a legacy closure to capture
register-passable values by copy. This decorator causes a nested function to
copy the value of the indicated variable into the closure object at the point of
formation instead of capturing that variable by reference. This allows you to
pass the closure as a parameter, but lifetimes aren't guaranteed to be
respected.
def foo(x: Int):
var z = x
@__copy_capture(z)
@parameter
def formatter() -> Int:
return z
z = 2
print(formatter())
def main():
foo(5)