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How to declare DYNAMIC MULTICAST delegate with TMap?

While this code works well

 DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FTestDelegate, TArray<int32>, ParamName);

I can't do that with TMap

 DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FTestDelegate, TMap<int32, int32>, ParamName);

Why? DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam is marcro and TMap<int32, int32> has comma inside. So we can't use that inside this macro. Preprocessor thinks int32> is next macro parameter (not an template parameter).

What I try?

 #define COMBINE(a, ...) a, __VA_ARGS__
 DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FTestDelegate, COMBINE(TMap<int32, int32>), ParamName);

Not a chance:

error : Unrecognized type 'COMBINE' - type must be a UCLASS, USTRUCT or UENUM

 typedef TMap<int32, int32> FMyMap;

Not a chance and here:

error : Unrecognized type 'FMyMap' - type must be a UCLASS, USTRUCT or UENUM

So, the problem in Unreal Header Tool, that tool has no possibilities to bypass this trick(s). I wish the UHT understood typedef or using keywords in parsing algorithms.

What do you think?

Product Version: UE 4.18
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asked Dec 06 '17 at 01:37 PM in C++ Programming

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