What is the c++ equivalent for random float in range from stream?

The FMath library is what you’re looking for

FMath::RandRange(0.1, 1.0);

In case you dont already know, when you hover over a blueprint node such as the “Random float in Range” node, it’ll tell you what library its from (which is useful if you want to use it in C++).
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(In this particular instance, both the FMath library and UKismetMathLibrary have this same function.