Enumerated Type Safe Casting
When code generated for a Simulink Data Type Conversion
block or a Stateflow block casts data to an enumerated type,
and the block's Saturate on integer overflow option
is selected, the cast uses a safe-cast function. The following code
shows a safe-cast function for BasicColors:
static int32_T ET08_safe_cast_to_BasicColors(int32_T input)
{
int32_T output;
/* Initialize output value to default value for BasicColors (Red) */
output = 0;
if ((input >= 0) && (input <= 2)) {
/* Set output value to input value if it is a member of BasicColors */
output = input;
}
return output;
}The cast fails if the value to be cast does not correspond to
one of the enumerated values in the enumerated type. When a safe cast
fails, the value returned is the underlying integer of the enumerated
type's default value. The above code reflects this default for BasicColors.
See Specifying a Default Enumerated Value in the Simulink documentation
for more information.
When a block's Saturate on integer overflow option
is cleared, and the block casts to an enumerated type, the resulting
code does not use safe casting. The code is therefore more efficient,
but is more vulnerable to runtime errors. No warning about the lack
of safe casting appears during code generation.
 | Default Code for an Enumerated Data Type | | Overriding Default Methods (Optional) |  |
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