x

Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

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;
 DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FTestDelegate, FMyMap, ParamName);

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
Tags:
more ▼

asked Dec 06 '17 at 01:37 PM in C++ Programming

avatar image

broly
569 44 64 92

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

0 answers: sort voted first
Be the first one to answer this question
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question