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

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Closes #368
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Mateusz Loskot 2015-06-30 11:33:44 +02:00
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doc/faq.md
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@ -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`. 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) ## Document/Value (DOM)
1. What is move semantics? Why? 1. What is move semantics? Why?