Explicit conversions exist for two reasons: to allow for making implicit conversions explicit, and to enable conversions which are not possible implicitly.
type_conversion:
entity_type `(' expression `)'
;
Allowed explicit conversions are any conversion which is implicitly
possible; conversion of an integer type to a narrower integer type;
conversion of the wide floating point type to the narrow floating point
type; conversion from integer to floating point and vice versa;
conversion from a class to a subclass thereof; and conversion from
ByteString to selector if the ByteString typed
expression is a string constant.
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