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Add missing definitions for dynamic sized types and fat pointer types #527

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Oct 16, 2024
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Add missing definitions for dynamic sized types and fat pointer types #527

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3 changes: 1 addition & 2 deletions src/glossary.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -2278,8 +2278,7 @@ fat pointer type
^^^^^^^^^^^^^^^^

:dp:`fls_l8ew6udd79hh`
A :dt:`fat pointer type` is an :t:`indirection type` that refers to a
:t:`dynamically sized type`.
A :dt:`fat pointer type` is an :t:`indirection type` whose contained :t:`type specification` is a :t:`dynamically sized type`.
Comment on lines -2282 to +2281
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Is it right that the same text is here and in src/types-and-traits.rst?

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Yes the glossary tends to just duplicate the definition in the actual files


.. _fls_qi21fdknzez6:

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9 changes: 8 additions & 1 deletion src/types-and-traits.rst
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Expand Up @@ -1373,6 +1373,12 @@ Type Layout
:dp:`fls_kdbq02iguzgl`
All :t:`[value]s` have an :t:`alignment` and a :t:`size`.

:dp:`fls_26Xgem831Nqg`
A :dt:`dynamically sized type` is a :t:`type` that does not implement the :std:`core::marker::Sized` :t:`trait`.

:dp:`fls_ozYgHEHFTT5c`
A :dt:`fat pointer type` is an :t:`indirection type` whose contained :t:`type specification` is a :t:`dynamically sized type`.

:dp:`fls_muxfn9soi47l`
The :t:`alignment` of a :t:`value` specifies which addresses are valid for
storing the :t:`value`. :t:`Alignment` is measured in bytes, is at least one,
Expand Down Expand Up @@ -1453,8 +1459,9 @@ For a :t:`function pointer type`, the :t:`size` and :t:`alignment` are those of
a :t:`thin pointer`.

:dp:`fls_e5hivr6m5s3h`
For a :t:`fat pointer`, the :t:`size` and :t:`alignment` are tool-defined, but
For a :t:`fat pointer type`, the :t:`size` and :t:`alignment` are tool-defined, but
are at least those of a :t:`thin pointer`.
For a :t:`fat pointer type` whose contained :t:`type` is that of a :t:`slice` or :t:`trait object type` the :t:`size` is that of two times the size of :t:`type` :c:`usize` and the :t:`alignment` is that of :t:`type` :c:`usize`.

:dp:`fls_hlbsjggfxnt2`
For a :t:`trait object type`, the :t:`layout` is the same as the :t:`value`
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