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Update book
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book/src/concepts/casting.md

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@@ -9,8 +9,9 @@ SPDX-License-Identifier: MIT OR Apache-2.0
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With the [base](../bridge/attributes.md) attribute, it is possible to inherit from another type.
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In order to access this parent class, we provide an API to cast up or down.
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Currently, this is only supported for objects in `extern "RustQt"` blocks, which have either a `#[qobject]` attribute,
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Currently, this is supported for objects in both `extern "RustQt"` *and* `extern "C++Qt"` blocks, which have either a `#[qobject]` attribute,
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or a `#[base = T]` attribute. see [here](../bridge/attributes.md) for more details on these attributes.
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> Note: Types in "C++Qt" blocks are **required** to have the `#[qobject]` attribute
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## Accessing the base class
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