Re: How to do "Compile time" initialization of record array?
- From: "Nicholas Paldino [.NET/C# MVP]" <mvp@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 30 Dec 2005 15:04:30 -0500
It should be noted that there is proposed syntax for C# 3.0 which will
allow initialization with the following syntax:
public struct MyStruct
{
public double L;
public double M;
public double S;
}
MyStruct[] lengthArray[] = new MyStruct[]
{
{ L = 1.267004226, M = 49.988884080, S = 0.053112191},
{ L = 0.511237696, M = 52.695975300, S = 0.048692684},
{ L = -0.452244460, M = 56.628428550, S = 0.044116830}
}
I might have not gotten it completely correct, but the syntax is
something like that.
What actually gets compiled is the same array initialization as there is
now, but code that will actually populate the properties/fields like regular
assignments. It's been a while since I used the C# 3.0 preview, but the
proposed spec amendments go into much more detail.
--
- Nicholas Paldino [.NET/C# MVP]
- mvp@xxxxxxxxxxxxxxxxxxxxxxxxxxx
"Jon Skeet [C# MVP]" <skeet@xxxxxxxxx> wrote in message
news:MPG.1e1f96f3a864606598cc2c@xxxxxxxxxxxxxxxxxxxxxxx
> John Kelsey <kelseyj@xxxxxxxxxx> wrote:
>> For example, one of my "C" programs has
>>
>> struct
>> {
>> double L;
>> double M;
>> double S;
>> } LengthArray[] = {
>> { 1.267004226, 49.988884080, 0.053112191}, // 1
>> { 0.511237696, 52.695975300, 0.048692684}, // 2
>> { -0.452244460, 56.628428550, 0.044116830}, // 3
>>
>> This is some statistical data (there are 76 records per array) and I have
>> Length, Weight, and Circumference arrays.
>>
>> I typically am targeting some low "horsepower" handheld devices.
>>
>> Even in C, I could run time initialize my arrays but I didn't for at
>> least a
>> couple of reasons...
>> 1) Performance, why waste runtime cycles building an array when it could
>> be
>> pre-built by the compiler
>> 2) Run time building meant that I carried two copies of my data in the
>> "execution footprint". One copy in code segment and the other copy in
>> the
>> data segment.
>
> In both of these cases, I'd expect the time and memory taken to be
> really pretty tiny. You'll be wasting a few K and a couple of
> milliseconds (once), even on a handheld device. These days, that's not
> likely to be a significant problem.
>
>> I understand that this really doesn't present a challenge to a modern
>> device, especially in a desktop environment, it was just a style I
>> have/had.
>
> Sure.
>
>> I don't understand C# the way I do C. Things that used to be important,
>> no
>> longer seem to matter as much.
>
> Indeed. However, the things which were a real pain in C are much easier
> in C# and .NET. Modern languages tend to value the time of the
> developer over the time of the processor, on the grounds that it's
> generally a lot more expensive :)
>
>> I've appreciated all of the responses and I'm certain I'll ask more "old
>> fashioned" questions as I learn.
>
> Goodo. Do keep 'em coming.
>
> --
> Jon Skeet - <skeet@xxxxxxxxx>
> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
> If replying to the group, please do not mail me too
.
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- How to do "Compile time" initialization of record array?
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