Thank you Johan and Jameson.
Johan, I don't know how to make a loop on the fields with a function. For
example this doesn't work:
function removeLine(poly::Poly, index::Int)
for op = (:a, :b, :x1, :y1, :x2, :y2, :typ)
splice!(poly.$op, index)
end
end
How to do, please ?
Le jeudi 8 mai 2014 15:59:06 UTC+2, Jameson a écrit :
>
> Replace your macro with a function and delete the uses of eval. You code
> will be faster, and easier to understand. Most of the difficulty people
> seem to have with macros comes from thinking they are a type of function
> call -- the @ character is supposed to remind you that this is not true.
>
> On Thursday, May 8, 2014, Johan Sigfrids <[email protected]<javascript:>>
> wrote:
>
>> I myself have been hitting my head against the wall that is
>> meta-programming in Julia. I think I can answer your first question at
>> least.
>>
>> Q1: This is because the line poly = emptyPoly doesn't create a new copy
>> of a ploygon but a reference to the empty one so that both poly and
>> emptyPoly
>> refer to the same data. You need to do poly = deepcopy(emptyPoly) .
>>
>> On Thursday, May 8, 2014 9:56:27 AM UTC+3, Stéphane Laurent wrote:
>>
>> Hello everybody,
>>
>> Below I define two new types : Line and Poly. The Poly type is intended
>> for stacking some lines.
>>
>> type Line
>>
>> a::Float64 # intercept
>>
>> b::BigFloat # slope
>>
>> x1::BigFloat # x-coordinate of first vertex
>>
>> y1::BigFloat # y-coordinate of first vertex
>>
>> x2::BigFloat # x-coordinate of second vertex
>>
>> y2::BigFloat # y-coordinate of second vertex
>>
>> typ::Bool # type of the line (true:upper, false:lower)
>>
>> end
>>
>>
>> type Poly
>>
>> a::Vector{Float64}
>>
>> b::Vector{BigFloat}
>>
>> x1::Vector{BigFloat}
>>
>> y1::Vector{BigFloat}
>>
>> x2::Vector{BigFloat}
>>
>> y2::Vector{BigFloat}
>>
>> typ::Vector{Bool}
>>
>> end
>>
>>
>>
>> I also define the empty Poly:
>>
>> emptyPoly = Poly(Array(Float64,0), Array
>>
>>
