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Update const eval chapter to latest changes #842

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Merged
merged 5 commits into from
Jul 12, 2020
Merged

Update const eval chapter to latest changes #842

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31f087e
Update const eval chapter to latest changes
oli-obk Jun 30, 2020
7cc2ee2
Address review comments
oli-obk Jul 1, 2020
167d751
Explain differences between const functions and const contexts
oli-obk Jul 1, 2020
8acf907
Some more precise explanations of which features are allowed in const…
oli-obk Jul 12, 2020
e9d9b2e
Link to transmute and make it its own point
oli-obk Jul 12, 2020
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Explain differences between const functions and const contexts
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@oli-obk
oli-obk committed Jul 1, 2020
commit 167d75106949fcd83eb6925ee91a0b6e15fcc7a4
10 changes: 10 additions & 0 deletions src/const_eval.md
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Expand Up @@ -63,6 +63,16 @@ A _const fn_ is a function that one is permitted to call from a const context. D
`const` has no effect on any existing uses, it only restricts the types that arguments and the
return type may use, as well as prevent various expressions from being used within it.

Notable features that const contexts have, but const fn haven't are:

* floating point types
* `dyn Trait` types
* generic bounds on generic parameters beyond `Sized`
* dereferencing of raw pointers
* casting raw pointers to integers
* comparing raw pointers
* union field access

[arithmetic]: expressions/operator-expr.md#arithmetic-and-logical-binary-operators
[array expressions]: expressions/array-expr.md
[array indexing]: expressions/array-expr.md#array-and-slice-indexing-expressions
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