• Florian Sonnenberger (19/20) Nov 04 2005 I'd like to do the following:
• BCS (9/29) Nov 04 2005 I think length is a value. This is not to say that the compiler couldn't...
• Florian Sonnenberger (23/73) Nov 05 2005 I've ever thought array.length was a function that calls some internal

Florian Sonnenberger <nairolf online.de> writes:

I'd like to do the following:

struct foo
{
     int[] bar;
     alias bar.length size;         // Line 19
}

So that I can get the length of someFoo.bar with someFoo.size .

This should be ok, since www.digitalmars.com/d/declaration.html says:
  A symbol can be declared as an alias of another symbol. (...)

A property is actually a function, and functions are symbols.
But the above code gives me these errors:

foobar.d(19): no property 'length' for type 'int[]'
foobar.d(19): bar.length is used as a type

The first one is somewhat strange.

This doesn't only happen if declared in a struct, it was just an example.

Bug?
Not yet implemented?
Will never get implemented?


Thanks,
Florian

BCS <BCS_member pathlink.com> writes:

I think length is a value. This is not to say that the compiler couldn't make a
function to get the value.


try this:

struct foo
{
int[] bar;
typeof(bar.length) size() {return bar.length;}
}




In article <dkgoan$2vhe$1 digitaldaemon.com>, Florian Sonnenberger says...
I'd like to do the following:

struct foo
{
     int[] bar;
     alias bar.length size;         // Line 19
}

So that I can get the length of someFoo.bar with someFoo.size .

This should be ok, since www.digitalmars.com/d/declaration.html says:
  A symbol can be declared as an alias of another symbol. (...)

A property is actually a function, and functions are symbols.
But the above code gives me these errors:

foobar.d(19): no property 'length' for type 'int[]'
foobar.d(19): bar.length is used as a type

The first one is somewhat strange.

This doesn't only happen if declared in a struct, it was just an example.

Bug?
Not yet implemented?
Will never get implemented?


Thanks,
Florian

Florian Sonnenberger <nairolf online.de> writes:

BCS schrieb:
 I think length is a value. This is not to say that the compiler couldn't make a
 function to get the value.
 
 
 try this:
 
 struct foo
 {
 int[] bar;
 typeof(bar.length) size() {return bar.length;}
 }
 
 
 
 
 In article <dkgoan$2vhe$1 digitaldaemon.com>, Florian Sonnenberger says...
 
I'd like to do the following:

struct foo
{
    int[] bar;
    alias bar.length size;         // Line 19
}

So that I can get the length of someFoo.bar with someFoo.size .

This should be ok, since www.digitalmars.com/d/declaration.html says:

 A symbol can be declared as an alias of another symbol. (...)

A property is actually a function, and functions are symbols.
But the above code gives me these errors:

foobar.d(19): no property 'length' for type 'int[]'
foobar.d(19): bar.length is used as a type

The first one is somewhat strange.

This doesn't only happen if declared in a struct, it was just an example.

Bug?
Not yet implemented?
Will never get implemented?


Thanks,
Florian

 
 

I've ever thought array.length was a function that calls some internal 
functions of the GC to allocate more memory or mark it as garbage.
But you are right, it's just a uint variable.
Though, alias does also work with variables:

struct foo
{
     uint bar;
}

int main( char[][] args )
{
     foo someFoo;
     alias someFoo.bar qwert;
     return 0;
}

No problem with that.
It only seems not to work for those /magic/ properties (or variables) 
like .length, .sizeof, .min, .max, .alignof, .dup, .init, ...

I first had a wrapper function like yours but I thought the alias 
methode was better because it doesn't need one extra function call.
BTW, will such small functions get inlined by the compiler?


Thanks,
Florian