Thanks. Cool ideas! P
On Thursday, January 15, 2015 at 12:08:05 PM UTC-8, Mauro wrote: > > Have you read this recent thread and its examples? > https://groups.google.com/d/msg/julia-dev/JEiH96ofclY/_amm9Cah6YAJ > > M > > On Thu, 2015-01-15 at 20:50, Petr Krysl <[email protected] <javascript:>> > wrote: > > So the "call" syntax on a type works, but using the implementation > > referenced above, it is SLOW. > > > > # Slow, function callback > > function test1(f, n) > > summ=0 > > for i=1:n > > summ=summ+f(i) > > end > > return summ > > end > > > > g(i::Int)=i > > > > # Fast, hardwired function g() > > function test2(n) > > summ=0 > > for i=1:n > > summ=summ+g(i) > > end > > return summ > > end > > > > # Fast, using method defined for an object > > function test4{T}(o::T, n) > > summ=0 > > for i=1:n > > summ=summ+get(o,i) > > end > > return summ > > end > > > > type MyFun1 > > end > > function get(o::MyFun1,i::Int) > > return g(i) > > end > > > > # Slow, using "call" on a singleton > > type MyFun3 end > > call(::Type{MyFun3},i::Int)=g(i)::Int > > > > n=10002345; > > @time println("test1(g, n) = $( test1(g, n) )") > > @time println("test2(n) = $( test2(n) )") > > @time println("test4(MyFun1(), n) = $( test4(MyFun1(), n) )") > > @time println("test1(MyFun3, n) = $( test1(MyFun3, n) )") > > > > julia> include("fun.jl") > > test1(g, n) = 50023457750685 > > elapsed time: 0.610016329 seconds (480173520 bytes allocated, 27.80% gc > > time) > > test2(n) = 50023457750685 > > elapsed time: 0.003086749 seconds (75304 bytes allocated) > > test4(MyFun1(), n) = 50023457750685 > > elapsed time: 0.004098207 seconds (90436 bytes allocated) > > test1(MyFun3, n) = 50023457750685 > > elapsed time: 0.665630908 seconds (480184232 bytes allocated, 23.21% gc > > time) > >
