C++ function never return int64. Works like with int32. As example,
.h
UFUNCTION(BlueprintCallable, meta = (DisplayName = “TestFunc”))
static int64 TestFunc();
.cpp
int64 TestFunc(){
return 2147483647+2;
}
returns -2147483647
I cant fix it, help, please.
The issue is that you are doing the operation with two int32 and then converting to int64: StaticCast<int64>( (int32 + int32) ). You need to do the operation between an int32 against int64 so the number doesnt overflow.
For example:
int64 i = MAX_int32;
i += 2;
return i; // 2147483649
//
return StaticCast<int64>(MAX_int32) + 2; // 2147483649
// ..
return MAX_int32 + StaticCast<int64>(0) + 2; // 2147483649
// ..
return MAX_int32 + 2 + StaticCast<int64>(0); // -2147483647
// ..
return StaticCast<int64>(MAX_int32 + 2); // -2147483647
// ..
UE_LOG(LogTemp, Warning, TEXT("int64: %lld"), TestFunc());
Hope it helps.
Ok, thank you. It really works for C++, but still not works when i’m trying return result to Blueprints. Maybe you know how to solve this problem?
EDIT: We have to convert from int64 → text → string because the the only function in KismetTextLibrary.h that takes int64 as parameter is static FText Conv_Int64ToText(...).
Wow, it works. Thank you too much.
Thanks for this.
Do you happen no know why this produces values like this, it seems like if it’s above max in32 it doesn’t work and it returns -2147483648
There’s an overloaded 64 version and I think it’s calling it but it also has the same issue, I tested in C++, I changed TruncToInt with TruncToInt64 and it worked, I think it’s a bug.
Should’ve dedicate a bit more time digging. My mistake.
Oh you’re fine, you provided the correct location of where the issue might be. I think I’ll submit a bug report unless someone else provides a good explanation of this behavior.
