• DLearner (29/30) Aug 11 2015 Static array properties are:
• John Colvin (11/41) Aug 11 2015 2 choices:
• jmh530 (6/16) Aug 11 2015 The OP could also make it a property to make it even more

"DLearner" <bmqazwsx123 gmail.com> writes:

 From dlang:




Static array properties are:
...
.dup	Create a dynamic array of the same size and copy the 
contents of the array into it.
.idup	Create a dynamic array of the same size and copy the 
contents of the array into it. The copy is typed as being 
immutable.
...
Dynamic array properties are:
...
.dup	Create a dynamic array of the same size and copy the 
contents of the array into it.
.idup	Create a dynamic array of the same size and copy the 
contents of the array into it. The copy is typed as being 
immutable. D 2.0 only
...
<<<

The problem:
'dup' is an abbreviation of 'duplicate'.
However, for static arrays, result is not a true duplicate of the 
source.
But, for dynamic arrays, result is a true duplicate.
So the same abbreviation produces two different effects.
Bugsource?

Suggested solution:
For static arrays, replace '.dup' with '.dyn' (and similarly for 
'idup').
Use of 'dyn' would also add clarity.

"John Colvin" <john.loughran.colvin gmail.com> writes:

On Tuesday, 11 August 2015 at 08:59:50 UTC, DLearner wrote:
 From dlang:




 Static array properties are:
 ...
 .dup	Create a dynamic array of the same size and copy the 
 contents of the array into it.
 .idup	Create a dynamic array of the same size and copy the 
 contents of the array into it. The copy is typed as being 
 immutable.
 ...
 Dynamic array properties are:
 ...
 .dup	Create a dynamic array of the same size and copy the 
 contents of the array into it.
 .idup	Create a dynamic array of the same size and copy the 
 contents of the array into it. The copy is typed as being 
 immutable. D 2.0 only
 ...
 <<<

 The problem:
 'dup' is an abbreviation of 'duplicate'.
 However, for static arrays, result is not a true duplicate of 
 the source.
 But, for dynamic arrays, result is a true duplicate.
 So the same abbreviation produces two different effects.
 Bugsource?

 Suggested solution:
 For static arrays, replace '.dup' with '.dyn' (and similarly 
 for 'idup').
 Use of 'dyn' would also add clarity.

2 choices:
1) break people's code and documentation by renaming .dup on 
static arrays
2) have 2 equivalent names for the same thing

Neither is likely to happen.

If you want it for your own code:

T[] dyn(T, size_t n)(T[n] a)
{
     return a.dup;
}

"jmh530" <john.michael.hall gmail.com> writes:

On Tuesday, 11 August 2015 at 09:08:57 UTC, John Colvin wrote:
 2 choices:
 1) break people's code and documentation by renaming .dup on 
 static arrays
 2) have 2 equivalent names for the same thing

 Neither is likely to happen.

 If you want it for your own code:

 T[] dyn(T, size_t n)(T[n] a)
 {
     return a.dup;
 }

The OP could also make it a property to make it even more 
similar. Perhaps the least amount of work would be if alias 
worked on functions (I don't see anything in the docs about that).

The broader issue that it is very easy to mix up static and 
dynamic arrays remains.