Nested containers are not supported

Development Programming & Scripting
1

Hi.

My code is

static void InsertRowsIntoTable(const FString DatabaseName, const FString TableName, TArray<TArray<FSQLiteTableField>> rowsOfFields);

And it gets error:

1>------ Build started: Project: SQLite, Configuration: Development_Editor x64 ------
1>  Parsing headers for SQLiteEditor
1>  C:/Art/Projects/3D/MyGame/Plugins/SQLite3UE4/Plugins/SQLite3UE4Plugin/Source/SQLite3UE4Plugin/Classes/SQLiteDatabase.h(258) : Nested containers are not supported.
1>  Reflection code generated for SQLiteEditor
1>  Performing 8 actions (2 in parallel)
1>  MyActor.cpp
1>  PCH.SQLite3UE4PluginPrivatePCH.h.cpp
1>C:\Art\Projects\3D\MyGame\Plugins\SQLite3UE4\Plugins\SQLite3UE4Plugin\Source\SQLite3UE4Plugin\Classes\SQLiteDatabase.h(198): error C2660: 'USQLiteDatabase::InsertRowsIntoTable' : function does not take 2 arguments
1>C:\Art\Projects\3D\MyGame\Plugins\SQLite3UE4\Plugins\SQLite3UE4Plugin\Source\SQLite3UE4Plugin\Classes\SQLiteDatabase.h(198): error C2660: 'USQLiteDatabase::InsertRowsIntoTable' : function does not take 2 arguments
1>  -------- End Detailed Actions Stats -----------------------------------------------------------
1>ERROR : UBT error : Failed to produce item: C:\Art\Projects\3D\MyGame\Plugins\SQLite3UE4\Plugins\SQLite3UE4Plugin\Binaries\Win64\UE4Editor-SQLite3UE4Plugin.pdb
1>  Total build time: 50,65 seconds
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.MakeFile.Targets(38,5): error MSB3073: The command ""C:\Program Files\Epic Games\4.8\Engine\Build\BatchFiles\Build.bat" SQLiteEditor Win64 Development "C:\Art\Projects\3D\MyGame\Plugins\SQLite3UE4\SQLite.uproject" -rocket" exited with code -1.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

How can I realize nested arrays?

Thank you.

2

Solution found there Two dimensional array - Programming & Scripting - Epic Developer Community Forums in answer from @Erasio .

3

I know this is an older post, but for those coming here from a web search – It is possible to extend container classes and nest them within other containers. For example:

#include "Project.h"

class PROJECT_API TPKeyStringMap : public TMap<FKey, FString>
{
  // This class is a map of FKey to FString.
};

// ...

TMap<SomeOtherType, TPKeyStringMap> MyNestedMap;

Happy nesting!

1 Like
4

So, for when the link breaks: 2d array is unsupported. Workaround: use an array of structs, each containing an array.

5

Hello, does this still hold for UE5?

I’m watching the following video and around 6mins, we get reminded that “Nested Containers are not supported”.

https://dev.epicgames.com/community/learning/courses/mDa/programming-kickstart/JwJ/programming-schematic

6

Yes, this is still the case for UE5.

1 Like
7 
TArray<TArray<ATile*>> Tiles2DArray;

it works only for cpp,u can`t trying use “UPROPERTY” expose it to Blueprint

3 Likes