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Add to FAQ: How to clear-and-minimize a document? #372

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Add to FAQ: How to clear-and-minimize a document? #372

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Expand Up @@ -102,6 +102,21 @@

Some applications use 64-bit unsigned/signed integers. And these integers cannot be converted into `double` without loss of precision. So the parsers detects whether a JSON number is convertible to different types of integers and/or `double`.

8. How to clear-and-minimize a document or value?

* Call one of the `SetXXX()` methods - they call destructor which deallocates DOM data:

```
Document d;
...
d.SetObject(); // clear and minimize
```

* Alternatively, use equivalent of the [C++ swap with temporary idiom](https://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Clear-and-minimize):
```
d.Swap(Value(kObjectType).Move())
```

## Document/Value (DOM)

1. What is move semantics? Why?
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