Overriding func +( [ Double ], [ Double ] )
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Overriding func +( [ Double ], [ Double ] )
I want to define + function of [ Double ] like below.
+ function
[ Double ]
[ 2.0, 3.0, 4.0 ] + [ 5.0, 6.0, 7.0 ] -> [ 7.0, 9.0, 11.0 ]
So, I defined + function like below.
+ function
func +( _ l: [ Double ], _ r: [ Double ] ) -> [ Double ]
guard l.count == r.count else fatalError()
var v = [ Double ]( repeating: 0, count: l.count )
// Some adding operation
return v
It works unless without Foundation framework.
But when I include Foundation framework, it seems that in Foundation framework +( Array, Array ) has been already defined. So,
+( Array, Array )
[ 2.0, 3.0, 4.0 ] + [ 5.0, 6.0, 7.0 ]
gets
[ 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 ]
Does anyone know how to avoid this? Or is overriding +([ Double ],[ Double ]) alongside Foundation framework impossible?
+([ Double ],[ Double ])
Foundation framework
override
Is there an option to use
++ as an operator?– Eimantas
Aug 6 at 16:15
++
@RakeshaShastri Thanks, but adding override keyword makes error.
'override' can only be specified on class members– Satachito
Aug 6 at 16:19
'override' can only be specified on class members
@Satachito the
+ operator for Double (and any type of array) is used for concatenation (including String type too). So you're out of luck unless you want to swim against quite matured convention.– Eimantas
Aug 6 at 16:28
+
Double
String
Just tried the operator, and the override works, provided the override is declared before performing the operation.
– Cristik
Aug 7 at 15:51
1 Answer
1
As + for two Array operands has already been reserved for concatenating arrays, you'd have to resort to declaring your own infix operator. E.g. ~+:
+
Array
infix
~+
import Accelerate
infix operator ~+
func ~+( _ l: [ Double ], _ r: [ Double ] ) -> [ Double ]
guard l.count == r.count else fatalError()
var v = [ Double ]( repeating: 0, count: l.count )
vDSP_vaddD( l, 1, r, 1, &v, 1, vDSP_Length( v.count ) )
return v
print([ 2.0, 3.0, 4.0 ] ~+ [ 5.0, 6.0, 7.0 ]) // [7.0, 9.0, 11.0]
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Did you try adding the
overridekeyword?– Rakesha Shastri
Aug 6 at 16:15