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digitalmars.D.learn - Array is already defined

reply Vino <vino.bheeman hotmail.com> writes:
Hi All,

  Request your help on how to unset or delete an array, in the 
below example, we get an error "Common  is already defined".

Auto fn1 () {
Array!string Text;
Array!string Number;
return tuple(Text, Number);
}

Void main () {
static foreach(i; 0 .. 2) {
typeof(fn1()[i]) Common;
writeln(Common[]);
Common.delete or Common.Unset // Something similar like this
}

From,
Vino.B
Jan 05 2018
parent reply Jonathan M Davis <newsgroup.d jmdavisprog.com> writes:
On Friday, January 05, 2018 15:22:49 Vino via Digitalmars-d-learn wrote:

 Hi All,

   Request your help on how to unset or delete an array, in the
 below example, we get an error "Common  is already defined".

 Auto fn1 () {
 Array!string Text;
 Array!string Number;
 return tuple(Text, Number);
 }

 Void main () {
 static foreach(i; 0 .. 2) {
 typeof(fn1()[i]) Common;
 writeln(Common[]);
 Common.delete or Common.Unset // Something similar like this
 }

 From,
 Vino.B


static foreach does not create a new scope (if it did, it wouldn't work very
well at module or class/struct scope). If you declare any variables inside a
static foreach, give it an extra set of braces.

- Jonathan m Davis
Jan 05 2018
parent reply Vino <vino.bheeman hotmail.com> writes:
On Friday, 5 January 2018 at 15:28:58 UTC, Jonathan M Davis wrote:

 On Friday, January 05, 2018 15:22:49 Vino via 
 Digitalmars-d-learn wrote:

 Hi All,

   Request your help on how to unset or delete an array, in the
 below example, we get an error "Common  is already defined".

 Auto fn1 () {
 Array!string Text;
 Array!string Number;
 return tuple(Text, Number);
 }

 Void main () {
 static foreach(i; 0 .. 2) {
 typeof(fn1()[i]) Common;
 writeln(Common[]);
 Common.delete or Common.Unset // Something similar like this
 }

 From,
 Vino.B


 static foreach does not create a new scope (if it did, it 
 wouldn't work very well at module or class/struct scope). If 
 you declare any variables inside a static foreach, give it an 
 extra set of braces.

 - Jonathan m Davis


Hi Jonathan,

  Sorry , not able to get you, can you please point our as to 
where we need to added the braces in the below example.

void main () {
Array!int Keycol;
static foreach(i; 0 .. 3) {
typeof(read()[i]) Datacol;
Datacol.insertBack(sort(read[i].dup[]).uniq);
foreach(k; read[i]) { 
Keycol.insertBack(Datacol[].countUntil(k));} }
writeln (Datacol[], Keycol[]);
}

From,
Vino.B
Jan 05 2018
next sibling parent reply Steven Schveighoffer <schveiguy yahoo.com> writes:
On 1/5/18 10:56 AM, Vino wrote:

 On Friday, 5 January 2018 at 15:28:58 UTC, Jonathan M Davis wrote:

 On Friday, January 05, 2018 15:22:49 Vino via Digitalmars-d-learn wrote:

 Hi All,

   Request your help on how to unset or delete an array, in the
 below example, we get an error "Common  is already defined".

 Auto fn1 () {
 Array!string Text;
 Array!string Number;
 return tuple(Text, Number);
 }

 Void main () {
 static foreach(i; 0 .. 2) {
 typeof(fn1()[i]) Common;
 writeln(Common[]);
 Common.delete or Common.Unset // Something similar like this
 }

 From,
 Vino.B


 static foreach does not create a new scope (if it did, it wouldn't 
 work very well at module or class/struct scope). If you declare any 
 variables inside a static foreach, give it an extra set of braces.

 - Jonathan m Davis


 
 Hi Jonathan,
 
   Sorry , not able to get you, can you please point our as to where we 
 need to added the braces in the below example.
 
 void main () {
 Array!int Keycol;
 static foreach(i; 0 .. 3) {


{

 typeof(read()[i]) Datacol;
 Datacol.insertBack(sort(read[i].dup[]).uniq);
 foreach(k; read[i]) { Keycol.insertBack(Datacol[].countUntil(k));} 


}

 }
 writeln (Datacol[], Keycol[]);
 }


-Steve
Jan 05 2018
parent reply Vino <vino.bheeman hotmail.com> writes:
On Friday, 5 January 2018 at 16:07:49 UTC, Steven Schveighoffer 
wrote:

 On 1/5/18 10:56 AM, Vino wrote:

 On Friday, 5 January 2018 at 15:28:58 UTC, Jonathan M Davis 
 wrote:

 On Friday, January 05, 2018 15:22:49 Vino via 
 Digitalmars-d-learn wrote:

 Hi All,

   Request your help on how to unset or delete an array, in 
 the
 below example, we get an error "Common  is already defined".

 Auto fn1 () {
 Array!string Text;
 Array!string Number;
 return tuple(Text, Number);
 }

 Void main () {
 static foreach(i; 0 .. 2) {
 typeof(fn1()[i]) Common;
 writeln(Common[]);
 Common.delete or Common.Unset // Something similar like this
 }

 From,
 Vino.B


 static foreach does not create a new scope (if it did, it 
 wouldn't work very well at module or class/struct scope). If 
 you declare any variables inside a static foreach, give it an 
 extra set of braces.

 - Jonathan m Davis


 
 Hi Jonathan,
 
   Sorry , not able to get you, can you please point our as to 
 where we need to added the braces in the below example.
 
 void main () {
 Array!int Keycol;
 static foreach(i; 0 .. 3) {


 {

 typeof(read()[i]) Datacol;
 Datacol.insertBack(sort(read[i].dup[]).uniq);
 foreach(k; read[i]) { 
 Keycol.insertBack(Datacol[].countUntil(k));}


 }

 }
 writeln (Datacol[], Keycol[]);
 }


 -Steve


Hi Steve,

  if we add the braces we are getting the Error: undefined 
identifier Datacol

void main () {
Array!int Keycol;
static foreach(i; 0 .. 3) {
	{
		typeof(read()[i]) Datacol;
		Datacol.insertBack(sort(read[i].dup[]).uniq);
		foreach(k; read[i]) { 
Keycol.insertBack(Datacol[].countUntil(k));}
	}
}
	writeln (Datacol[], Keycol[]);
}

From,
Vino.B
Jan 05 2018
parent reply Steven Schveighoffer <schveiguy yahoo.com> writes:
On 1/5/18 11:39 AM, Vino wrote:

 
 Hi Steve,
 
   if we add the braces we are getting the Error: undefined identifier 
 Datacol
 
 void main () {
 Array!int Keycol;
 static foreach(i; 0 .. 3) {
      {
          typeof(read()[i]) Datacol;
          Datacol.insertBack(sort(read[i].dup[]).uniq);
          foreach(k; read[i]) {
Keycol.insertBack(Datacol[].countUntil(k));}
      }
 }
      writeln (Datacol[], Keycol[]);
 }


That's because writeln is outside the loop that defines Datacol.

Without knowing what you are trying to do, it's hard to further help.

-Steve
Jan 05 2018
parent Vino <vino.bheeman hotmail.com> writes:
On Friday, 5 January 2018 at 16:55:50 UTC, Steven Schveighoffer 
wrote:

 On 1/5/18 11:39 AM, Vino wrote:

 
 Hi Steve,
 
   if we add the braces we are getting the Error: undefined 
 identifier Datacol
 
 void main () {
 Array!int Keycol;
 static foreach(i; 0 .. 3) {
      {
          typeof(read()[i]) Datacol;
          Datacol.insertBack(sort(read[i].dup[]).uniq);
          foreach(k; read[i]) { 
 Keycol.insertBack(Datacol[].countUntil(k));}
      }
 }
      writeln (Datacol[], Keycol[]);
 }


 That's because writeln is outside the loop that defines Datacol.

 Without knowing what you are trying to do, it's hard to further 
 help.

 -Steve


Hi Steve,

  Thank you very much, was able to resolve the issue after adding 
the writeln within the braces, I am trying to implement a data 
dictionary compressing using D, and had 2 issue and this is one 
of the issue, and the other issue is detailed in the post "Error: 
variable i cannot be read at compile time", which contains the 
details of this program, if possible can you please help on on 
the other issue in the post "Error: variable i cannot be read at 
compile time".

From,
Vino.B
Jan 05 2018
prev sibling parent "H. S. Teoh" <hsteoh quickfur.ath.cx> writes:
On Fri, Jan 05, 2018 at 03:56:30PM +0000, Vino via Digitalmars-d-learn wrote:
[...]

 Hi Jonathan,
 
  Sorry , not able to get you, can you please point our as to where we
  need to added the braces in the below example.


Try this:

	void main () {
		Array!int Keycol;
		static foreach(i; 0 .. 3) {{
			typeof(read()[i]) Datacol;
			Datacol.insertBack(sort(read[i].dup[]).uniq);
			foreach(k; read[i]) {
				Keycol.insertBack(Datacol[].countUntil(k));
			}
		}}
		writeln (Datacol[], Keycol[]);
	}


T

-- 
Tech-savvy: euphemism for nerdy.
Jan 05 2018