I get the error:

ut_wrapper.d(38): ranges.opIndex(i) is not an lvalue

A. Line 38 is marked.
B. If ranges is made into a "class" the issue disappears.
C. If the expression is seperated, the issue disappears.
D. But changing the name "length" (in range.length) doesn't affect it.

:
: import std.stdio;
:
: //class range {  // B
: struct range {
:     size_t begin;
:     size_t end;
:
:     int length() // D
:     {
:         return end-begin;
:     }
: }
:
: class Container {
:     range opIndex(size_t i)
:     in
:     {
:         assert(i < data.length);
:     }
:     body
:     {
:         return data[i];
:     }
:
: private:
:     range[] data;
: }
:
: int main()
: {
:     Container ranges;
:
:     size_t i = 0;
:
:     //range r = ranges[i];   // C
:     //if (r.length == 1) {   // C
:     if (ranges[i].length == 1) {  // A. LINE 38
:         writefln("range==1");
:     }
:
:     return 0;
: }
:

Kevin

On Sun, 24 Apr 2005 23:30:56 +0000 (UTC), Kevin Bealer wrote:

> I get the error:
> 
> ut_wrapper.d(38): ranges.opIndex(i) is not an lvalue
> 
>
[snip]

I cannot reproduce that error with the code you gave us.

Here is your code with a couple of changes to get it to run okay. The changes are marked with //DJP but they shouldn't have influenced the reported error.

// ---------------------------
import std.stdio;

struct range {
     size_t begin;
     size_t end;

     int length() // D
     {
         return end-begin;
     }
 }

class Container {
     range opIndex(size_t i)
     in
     {
         assert(i < data.length);
     }
     body
     {
         return data[i];
     }

     // DJP To get at least one range to test.
     void AddRange(size_t b, size_t e)
     {
         data.length = data.length + 1;
         data[$-1].begin = b;
         data[$-1].end = e;
    }

 private:
     range[] data;
 }

 int main()
 {
     Container ranges = new Container; //DJP
     ranges.AddRange(2,6); //DJP

     size_t i = 0;

     if (ranges[i].length == 1) {
         writefln("range==1");
     }

     return 0;
 }

// ---------------------------


-- 
Derek Parnell
Melbourne, Australia
25/04/2005 9:57:21 AM

In article <fcl7wqonidem$.wcyai42foe58.dlg@40tude.net>, Derek Parnell says...
>
>On Sun, 24 Apr 2005 23:30:56 +0000 (UTC), Kevin Bealer wrote:
>
>> I get the error:
>> 
>> ut_wrapper.d(38): ranges.opIndex(i) is not an lvalue
>> 
>>
>[snip]
>
>I cannot reproduce that error with the code you gave us.
>
>Here is your code with a couple of changes to get it to run okay. The changes are marked with //DJP but they shouldn't have influenced the reported error.
>
(snip)

I actually hadn't thought to run the program (I'm working with a larger project and this is a boil-down of an error I saw).

The error I got was at compile time.  I checked the compile options, and the error goes away if "-inline" is not specified.

This is with version 0.121.

Kevin

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Hash: SHA1

Kevin Bealer schrieb am Sun, 24 Apr 2005 23:30:56 +0000 (UTC):
>
> I get the error:
>
> ut_wrapper.d(38): ranges.opIndex(i) is not an lvalue
>
> A. Line 38 is marked.
> B. If ranges is made into a "class" the issue disappears.
> C. If the expression is seperated, the issue disappears.
> D. But changing the name "length" (in range.length) doesn't affect it.
>
>:
>: import std.stdio;
>:
>: //class range {  // B
>: struct range {
>:     size_t begin;
>:     size_t end;
>:
>:     int length() // D
>:     {
>:         return end-begin;
>:     }
>: }
>:
>: class Container {
>:     range opIndex(size_t i)
>:     in
>:     {
>:         assert(i < data.length);
>:     }
>:     body
>:     {
>:         return data[i];
>:     }
>:
>: private:
>:     range[] data;
>: }
>:
>: int main()
>: {
>:     Container ranges;
>:
>:     size_t i = 0;
>:
>:     //range r = ranges[i];   // C
>:     //if (r.length == 1) {   // C
>:     if (ranges[i].length == 1) {  // A. LINE 38
>:         writefln("range==1");
>:     }
>:
>:     return 0;
>: }
>:
>
> Kevin

Added to DStress as http://dstress.kuehne.cn/run/opIndex_01.d http://dstress.kuehne.cn/run/opIndex_02.d http://dstress.kuehne.cn/run/opIndex_03.d http://dstress.kuehne.cn/run/opIndex_04.d

Thomas


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