When I try this, I get an error:
ERROR: type: test2: in apply, expected Function, got
CFunction{Float64,Float64}
It looks like "call" doesn't exist in version 0.3. I suppose I need 0.4 to
make this work. It doesn't appear from the docs that call used to be named
something else.
On Tuesday, January 20, 2015 at 4:54:08 PM UTC-6, Jeff Bezanson wrote:
>
> Here is a hack that basically works by escaping through the C type system:
>
> ```
> immutable CFunction{R,A}
> f
> p::Ptr{Void}
> CFunction(f) = new(f, cfunction(f, R, (A,)))
> end
>
> call{R,A}(f::CFunction{R,A}, x) = ccall(f.p, R, (A,), x)
>
> foo(x::Float64) = 0.0
> goo(x::Float64) = x
>
> function test1()
> for i=1:100000000
> f = foo
> r = f(1.0)
> goo(r)
> end
> end
>
> function test2()
> f = CFunction{Float64,Float64}(foo)
> for i=1:100000000
> r = f(1.0)
> goo(r)
> end
> end
> ```
>
> I added an argument to `foo` to increase the generality somewhat.
> test1() is the original test case. test2() is the new version. The
> CFunction object needs to be constructed outside the loop, but this
> can be stored in a data structure and reused anywhere.
>
> -Jeff
>
>
> On Tue, Jan 20, 2015 at 4:34 PM, Ivar Nesje <[email protected]
> <javascript:>> wrote:
> > Originally posted at https://github.com/JuliaLang/julia/issues/9863
>
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