I think this function is Engine Dev lossed. This is my supplement.
File:
\Engine\Classes\Kismet\KismetStringLibrary.h
Code:
/** Converts a string to an 64-bit integer value */
UFUNCTION(BlueprintPure, meta = (DisplayName = “String To Int64”, CompactNodeTitle = “->”, BlueprintAutocast), Category = “Utilities|String”)
static int64 Conv_StringToInt64(const FString& InString);
/** Converts a string to a double value */
UFUNCTION(BlueprintPure, meta = (DisplayName = "String To Double", CompactNodeTitle = "->", BlueprintAutocast), Category = "Utilities|String")
static double Conv_StringToDouble(const FString& InString);
File:
\Engine\Source\Runtime\Engine\Private\KismetStringLibrary.cpp
Code:
int64 UKismetStringLibrary::Conv_StringToInt64(const FString& InString)
{
return FCString::Atoi64(*InString);
}
double UKismetStringLibrary::Conv_StringToDouble(const FString& InString)
{
return FCString::Atod(*InString);
}