i think you're confused by the meaning of "value" (which is unfortunately
ambiguous and misleading).
look at the a, b and c examples. they seem consistent to me.
andrew
On Friday, 7 March 2014 19:05:23 UTC-3, Uwe Fechner wrote:
>
> Ok, I have now a working example:
>
> type AutopilotLog
> time::Float64
> counter::Int32
> AutopilotLog() = new();
> end
>
> function setfield(x, time::Symbol, value)
> x.time = value
> println("abc")
> end
>
> log = AutopilotLog()
> println(log)
> println(log.time)
>
> setfield(log, :time, 0.1)
> println(log)
>
> This gives the output:
>
> julia> setfield_test
> AutopilotLog(0.0,0)
> 0.0
> abc
> AutopilotLog(0.1,0)
> julia>
>
> But I have the impression that there is an error in the documentation. In
> the documentation it says:
>
> setfield(value, name::Symbol, x)
> Assign x to a named field in value of composite type. The syntax a.b =
> c calls setfield(a, :b, c), and the syntax a.(b) = c calls setfield(a, b,
> c).
> But I had to implement the function like this:function setfield(x,
> time::Symbol, value)
> which means I had to swap x and value. Did I understand something wrong or
> is the documentation wrong?
> Regards:
> Uwe
>
>
> On Friday, March 7, 2014 10:40:36 PM UTC+1, andrew cooke wrote:
>>
>>
>> julia> type Foo
>> a::Int
>> end
>>
>> julia> foo = Foo(3)
>> Foo(3)
>>
>> julia> setfield(foo, :a, 5)
>> WARNING: setfield is deprecated, use setfield! instead.
>> in setfield at deprecated.jl:8
>> 5
>>
>> julia> setfield!(foo, :a, 5)
>> 5
>>
>> julia> foo
>> Foo(5)
>>
>>
>> On Friday, 7 March 2014 18:35:25 UTC-3, Uwe Fechner wrote:
>>>
>>> Ok, even if overloading the dot operator is not yet implemented I would
>>> be pleased if someone could provide an example how to use the setfield
>>> function.
>>>
>>> Uwe
>>>
>>> On Friday, March 7, 2014 10:20:51 PM UTC+1, Ivar Nesje wrote:
>>>>
>>>> I do not think you can overload the . operator in Julia yet.
>>>> Setfield is only for calling to set the value.
>>>>
>>>> See also https://github.com/JuliaLang/julia/issues/1974
>>>>
>>>> kl. 22:16:09 UTC+1 fredag 7. mars 2014 skrev Uwe Fechner følgende:
>>>>>
>>>>> Hello,
>>>>>
>>>>> I am looking for an example how to use the setfield function.
>>>>> (see: http://docs.julialang.org/en/release-0.2/stdlib/base/ )
>>>>>
>>>>> The following does not work (setfield is not called when the field
>>>>> time is set):
>>>>>
>>>>> using ProtoBuf
>>>>> import ProtoBuf.meta
>>>>>
>>>>> type AutopilotLog
>>>>> time::Float64
>>>>> counter::Int32
>>>>> number::Int32
>>>>> AutopilotLog() = (x = new(); fillunset(x); x)
>>>>> end #type AutopilotLog
>>>>> meta(t::Type{AutopilotLog}) = meta(t, Symbol[:time,:counter], Int[],
>>>>> Dict{Symbol,Any}())
>>>>> function setfield(value, time::Symbol, x)
>>>>> x.time = value
>>>>> println("abc")
>>>>> end
>>>>>
>>>>> log = AutopilotLog()
>>>>> log.time = 0.0
>>>>>
>>>>> Any hint what I am doing wrong?
>>>>>
>>>>> Regards:
>>>>>
>>>>> Uwe (using Julia 0.21)
>>>>>
>>>>
