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Add 128-bit ints to ch3 #1230

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Mar 21, 2018
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Add 128-bit ints to ch3 #1230

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0293e3f
Add 128-bit ints to ch3
mark-i-m Mar 18, 2018
9ef40ac
Revert "Add 128-bit ints to ch3"
mark-i-m Mar 18, 2018
5f9fb52
Add 128-bit ints to newest features
mark-i-m Mar 18, 2018
ce3eb47
Update dictionary
mark-i-m Mar 19, 2018
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3 changes: 3 additions & 0 deletions second-edition/dictionary.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,7 @@ CPUs
cratesio
CRLF
cryptocurrencies
cryptographic
cryptographically
CStr
CString
Expand Down Expand Up @@ -227,6 +228,7 @@ libreoffice
libstd
lifecycle
LimitTracker
LLVM
lobally
locators
LockResult
Expand Down Expand Up @@ -272,6 +274,7 @@ namespace
namespaced
namespaces
namespacing
natively
newfound
NewJob
NewsArticle
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15 changes: 15 additions & 0 deletions second-edition/src/appendix-06-newest-features.md
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Expand Up @@ -112,3 +112,18 @@ fn main() {

The `...` syntax is still accepted in matches, but it is not accepted in
expressions. `..=` should be preferred.

## 128-bit integers

Rust 1.26.0 added 128-bit integer primitives:

- `u128`: A 128-bit unsigned integer with range [0, 2^128 - 1]
- `i128`: A 128-bit signed integer with range [-(2^127), 2^127 - 1]

These primitive are implemented efficiently via LLVM support. They
are available even on platforms that don't natively support 128-bit
integers and can be used like the other integer types.

These primitives can be very useful for algorithms that need to use
very large integers efficiently, such as certain cryptographic
algorithms.