As far as I known unreal engine c++ scripting does not go along with ifstream and other std::anytype stuffs. Recently however I just tried ifstream in curiosity : I made a actor class in c++ and made it read a txt file using std::ifstream and print it on screen and it worked!? Is this a kind of new in unreal engine5.2 or me being just naive?
ue doesn’t go well with std, as it has a bunch of its own similar stuff implemented diffirently. Nevertheless there is no “doesn’t work at all”, its “both ue & std works according to their implementations”, and in the plenty of cases data between them can be converted both ways, albeit sometimes it can be isn’t simple.
read a txt file using std::ifstream and print it on screen and it worked!?
It can work for simple cases, but, for example, have you tried to read non-ascii text? it may not work, depending on project settings, or be not (simply) convertable to FString\FText.
Nevertheless, afaik, some things in engine was replaced with std:: methods, so it’s just a matter of how well both implementations goes along in each particular case.
So, if you tested particular function and it works well in all cases you need - i see no problems using it. Well, unless there is ue’s analog that solves problem better.
Thanks for your kindness!! It really helped! 
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