UKismetMathLibrary::SelectFloat
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticBlueprintPureUFUNCTION
Description
Returns A if bPickA is true, otherwise returns B. Use to conditionally choose between two float/double values, such as toggling between walk and sprint speeds based on an input boolean.
Caveats & Gotchas
- • The C++ signature uses `double`, not `float`, reflecting UE5's promotion of Blueprint floats to double precision. UE4 projects migrated to UE5 may see silent implicit conversions if float locals are wired into this node — check for precision narrowing in performance-sensitive simulations.
- • NaN propagation: if either input is NaN, some compilers may propagate the NaN to the output even when that input is not the selected one, depending on optimization level and CPU floating-point mode. Guard NaN inputs explicitly if the source data is untrusted.
Signature
static UE_INL_API double SelectFloat(double A, double B, bool bPickA);Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| A | double | The float returned when bPickA is true. | — |
| B | double | The float returned when bPickA is false. | — |
| bPickA | bool | Selects A when true, B when false. | — |
Return Type
double Example
Toggle between walk and sprint speed based on sprint input C++
float DesiredSpeed = UKismetMathLibrary::SelectFloat(SprintSpeed, WalkSpeed, bIsSprinting);
GetCharacterMovement()->MaxWalkSpeed = DesiredSpeed;Tags
Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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