Pavel Stehule wrote:
One issue that just occurred to me: what if a variadic function
wants to turn around and call another variadic function, passing
the same array argument on to the second one? This is closely akin
to the problem faced by C "..." functions, and the solutions are
pretty ugly (sprintf vs vsprintf for instance). Can we do any
better? At least in the polymorphic case, I'm not sure we can :-(.
maybe with some flag like PARAMS?
SELECT least(PARAMS ARRAY[1,2,3,4,5,6])
Just FYI, this is more or less how ruby handles variadic functions - a
"*" before the last argument in the function's *definition* causes all
additional arguments to be stored in an array, while a "*" before the
last argument in a function *call* expands an array into single arguments.
So, you could e.g do
def variadic1(a, b, *c)
# c is in array containing all parameters after second one.
end
def variadic_wrapper(a, *b)
variadic1("foobar", a, *b)
end
So there is precedent for the "flag idea" too. Plus, I kind of like the
idea of using the same syntax for both wrapping and unwrapping of
variadic arguments.
regards, Florian Pflug
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