Documentation for method
Bridge assembled from the following types:
method Bridge(Int: --> Num)
Returns the integer converted to
Returns the number.
Returns the number, converted to
Default implementation coerces the invocant to Num and that's the behavior of this method in core Real types. This method primarily exist to make it easy to implement custom Real types by users, with the
Bridge method returning one of the core
Real types (NOT necessarily a Num) that best represent the custom
Real type. In turn, this lets all the core operators and methods obtain a usable value they can work with.
As an example, we can implement a custom
Temperature type. It has a unit of measure and the value, which are given during instantiation. We can implement custom operators or conversion methods that work with this type. When it comes to regular mathematical operators, however, we can simply use the
.Bridge method to convert the
Temperature to Kelvin expressed in one of the core numeric types:
is Realsub postfix:<℃>sub postfix:<℉>sub postfix:<K>my := 36.6℃;my := 451℉;my := 5778K;say ; # OUTPUT: «36.6 degrees C␤»say + + ; # OUTPUT: «6593.677777777778␤»say 123K + 456K; # OUTPUT: «579␤»
As we can see from the last two lines of the output, the type of the bridged result is not forced to be any particular core type. It is a Rat, when we instantiated
Temperature with a
Rat or when conversion was involved, and it is an Int when we instantiated
Temperature with an Int.