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Changed BasicJsonDocument's copy-constructor to copy the capacity

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Benoit Blanchon
2020-03-02 12:31:36 +01:00
parent c1b3705df1
commit 0853b04589
5 changed files with 71 additions and 36 deletions
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CHANGELOG.md
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@@ -13,6 +13,29 @@ HEAD
* Fixed incorrect string comparison on some platforms (issue #1198)
* Added move-constructor and move-assignment to `BasicJsonDocument`
* Added `BasicJsonDocument::garbageCollect()` (issue #1195)
* Changed copy-constructor of `BasicJsonDocument` to preserve the capacity of the source.
> ### BREAKING CHANGES
>
> #### Copy-constructor of `BasicJsonDocument`
>
> In previous versions, the copy constructor of `BasicJsonDocument` looked at the source's `memoryUsage()` to choose its capacity.
> Now, the copy constructor of `BasicJsonDocument` uses the same capacity as the source.
>
> Example:
>
> ```c++
> DynamicJsonDocument doc1(64);
> doc1.set(String("example"));
>
> DynamicJsonDocument doc2 = doc1;
> Serial.print(doc2.capacity()); // 8 with ArduinoJson 6.14
// 64 with ArduinoJson 6.15
> ```
>
> I made this change to get consistent results between copy-constructor and move-constructor, and whether RVO applies or not.
>
> If you use the copy-constructor to optimize your documents, you can use `garbageCollect()` or `shrinkToFit()` instead.
v6.14.1 (2020-01-27)
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