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Jonathan Turner
2015-08-25 10:17:18 -07:00
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04-Considering_Safety.md
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## Const as Much as Possible ## Const as Much as Possible
`const` tells the compiler that a variable or method is immutable. This helps the compiler optimize the code and helps the developer know if a function has a side effect. Also, using `const &` prevents the compiler from copying data unnecessarily. [Here](http://kotaku.com/454293019) are some comments on `const` from John Carmack. `const` tells the compiler that a variable or method is immutable. This helps the compiler optimize the code and helps the developer know if a function has a side effect. Also, using `const &` prevents the compiler from copying data unnecessarily. The [comments on `const` from John Carmack](http://kotaku.com/454293019) are also a good read.
```cpp ```cpp
// Bad Idea // Bad Idea