digitalmars.D.learn - a slew of questions about D...

clayasaurus <clayasaurus gmail.com> Oct 28 2005

Chris Sauls <ibisbasenji gmail.com> Oct 29 2005

clayasaurus <clayasaurus gmail.com> Oct 29 2005

Derek Parnell <derek psych.ward> Oct 29 2005

J C Calvarese <technocrat7 gmail.com> Oct 29 2005

clayasaurus <clayasaurus gmail.com> Oct 29 2005

clayasaurus <clayasaurus gmail.com> Oct 29 2005

clayasaurus <clayasaurus gmail.com> Oct 30 2005

"Jarrett Billingsley" <kb3ctd2 yahoo.com> Oct 30 2005

clayasaurus <clayasaurus gmail.com> Oct 30 2005

clayasaurus <clayasaurus gmail.com> Oct 30 2005

Derek Parnell <derek psych.ward> Oct 30 2005

clayasaurus <clayasaurus gmail.com> Oct 30 2005
Derek Parnell <derek psych.ward> Oct 30 2005

clayasaurus <clayasaurus gmail.com> Oct 30 2005
clayasaurus <clayasaurus gmail.com> Oct 30 2005

Chris Sauls <ibisbasenji gmail.com> Oct 30 2005

clayasaurus <clayasaurus gmail.com> Oct 30 2005

"Regan Heath" <regan netwin.co.nz> Oct 30 2005

Bruno Medeiros <daiphoenixNO SPAMlycos.com> Oct 31 2005

"Regan Heath" <regan netwin.co.nz> Oct 31 2005

"Walter Bright" <newshound digitalmars.com> Nov 02 2005

clayasaurus <clayasaurus gmail.com> writes:

1) can you do ... int function(const value) in D? or function(int value) 
const?

2) can you do versioning like...

static if (version == ONE || version == TWO)

or version(!Windows)

?

or what about...

version( ONE || !TWO)


3) can D do default values like c++? function(int num = 0)
and you can either call function() for function(5)


4) How would I convert the command #pragma warning( disable : 4800 ) to 
D? I'm not too keen on pragmas.


Thanks

~ Clay

Oct 28 2005

Chris Sauls <ibisbasenji gmail.com> writes:

clayasaurus wrote:
 1) can you do ... int function(const value) in D? or function(int value) 
 const?



 2) can you do versioning like...
 
 static if (version == ONE || version == TWO)



 or version(!Windows)



 or what about...
 
 version( ONE || !TWO)



 3) can D do default values like c++? function(int num = 0)
 and you can either call function() for function(5)


http://www.digitalmars.com/d/function.html

 4) How would I convert the command #pragma warning( disable : 4800 ) to 
 D? I'm not too keen on pragmas.


warnings in a compiler that ordinarily doesn't do warnings anyhow.  Although
now that we 
have the -w switch maybe there should be a disable pragma...  Not sure.  I
don't use -w 
all that often anyhow.

-- Chris Sauls

Oct 29 2005

clayasaurus <clayasaurus gmail.com> writes:

Chris Sauls wrote:
 clayasaurus wrote:
 
 1) can you do ... int function(const value) in D? or function(int 
 value) const?


 Technically (as I understand it) no.  Although it may not be /as/ 
 neccessary.
 
 2) can you do versioning like...

 static if (version == ONE || version == TWO)


 Should be able.
 


I wasn't able to do so, so I just used Derek's suggestion.

 or version(!Windows)


 I wish.
 
 or what about...

 version( ONE || !TWO)


 I wish again.
 
 3) can D do default values like c++? function(int num = 0)
 and you can either call function() for function(5)


 Yep.  For some time now.
 http://www.digitalmars.com/d/function.html


Cool.

 
 4) How would I convert the command #pragma warning( disable : 4800 ) 
 to D? I'm not too keen on pragmas.


 In this case, I believe you'd just skip it.  There's not much reason to 
 ignore-flag warnings in a compiler that ordinarily doesn't do warnings 
 anyhow.  Although now that we have the -w switch maybe there should be a 
 disable pragma...  Not sure.  I don't use -w all that often anyhow.


Yea, i'll just ignore it I guess. It is not so important in the scheme 
of things.

 
 -- Chris Sauls


Thanks

~ Clay

Oct 29 2005

Derek Parnell <derek psych.ward> writes:

On Sat, 29 Oct 2005 02:59:34 -0400, clayasaurus wrote:

 
 or version(!Windows)


No. You need to do ...

  version(Windows) else { } 

 
 or what about...
 
 version( ONE || !TWO)


No. You need to do ...

  version(ONE) version = X
  version(TWO) version = X
  version(X) { . . . }
 


-- 
Derek Parnell
Melbourne, Australia
29/10/2005 9:49:38 PM

Oct 29 2005

J C Calvarese <technocrat7 gmail.com> writes:

In article <98m793lpudd4$.1xzi56dp4vb37$.dlg 40tude.net>, Derek Parnell says...
On Sat, 29 Oct 2005 02:59:34 -0400, clayasaurus wrote:

 
 or version(!Windows)


No. You need to do ...

  version(Windows) else { } 

 
 or what about...
 
 version( ONE || !TWO)


No. You need to do ...

  version(ONE) version = X
  version(TWO) version = X
  version(X) { . . . }


Actually it looks like he's trying to do "! TWO", so I'd use an else:

version(ONE) version = X;
version(TWO) {} else version = X;
version(X) { . . . }

Even uglier more verbose, but I think it'll work.

jcc7

Oct 29 2005

clayasaurus <clayasaurus gmail.com> writes:

J C Calvarese wrote:
 In article <98m793lpudd4$.1xzi56dp4vb37$.dlg 40tude.net>, Derek Parnell says...
 
On Sat, 29 Oct 2005 02:59:34 -0400, clayasaurus wrote:



or version(!Windows)


No. You need to do ...

 version(Windows) else { } 


or what about...

version( ONE || !TWO)


No. You need to do ...

 version(ONE) version = X
 version(TWO) version = X
 version(X) { . . . }


 
 Actually it looks like he's trying to do "! TWO", so I'd use an else:
 
 version(ONE) version = X;
 version(TWO) {} else version = X;
 version(X) { . . . }
 
 Even uglier more verbose, but I think it'll work.
 
 jcc7


Yup. :-P Adding a simple ! to the version would make things much better, 
&& and || would be nice too, but I'm not sure how diffuclt these things 
would be to implement. I can live with 'else' for now.

Thanks

~ Clay

Oct 29 2005

clayasaurus <clayasaurus gmail.com> writes:

Derek Parnell wrote:
 On Sat, 29 Oct 2005 02:59:34 -0400, clayasaurus wrote:
 
  
 
or version(!Windows)


 
 No. You need to do ...
 
   version(Windows) else { } 


Oh ok. Seems like a bit of a hack though. Imagine if I wanted to do

version(!Windows)
{
}
else
{
}

Then I'm forced to do something like...
version = TRUE

version(Windows)
{
}
else version(TRUE) // version !Windows
{
}
else
{
}

Unless there is another way around?

 
 
or what about...

version( ONE || !TWO)


 
 No. You need to do ...
 
   version(ONE) version = X
   version(TWO) version = X
   version(X) { . . . }
  
 
 


I don't mind this as much as the !version hack.

Thanks.

~ Clay

Oct 29 2005

clayasaurus <clayasaurus gmail.com> writes:

I have another quick question...

does D have the c++ equivilent of #pragma pack(push,1), is it not needed 
with D, or just not implemented.

In the C++ code it is implemented like...

#pragma pack(push,1)

#pragma pack(1)

struct
{
   a, b, c;
}

#pragma pack(1)

struct
{
   ...
}

#pragma(pop, 1)

Can I get the D equivilent just by using the align attribute? Thanks.

~ Clay

Oct 30 2005

"Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:

"clayasaurus" <clayasaurus gmail.com> wrote in message 
news:dk3cit$klj$1 digitaldaemon.com...
 does D have the c++ equivilent of #pragma pack(push,1), is it not needed 
 with D, or just not implemented.
 Can I get the D equivilent just by using the align attribute? Thanks.


It's mostly not needed because of the better alignment support in D.  In 
C++, the pack push and pop operations are needed because normally member 
alignment is controlled by a command-line switch, so the pushing and popping 
is so that changing the alignment for one struct doesn't change it for all 
the rest.  But in D, to change the alignment for one struct, you just use 
the very obvious syntax:

align(1) struct Something
{
    ...
}

And the alignment will stay the same (i.e. the default, or whatever you set 
them to) on all the other structs in your program.

Oct 30 2005

clayasaurus <clayasaurus gmail.com> writes:

Ah, that explains it. Thanks : )

~ Clay

Jarrett Billingsley wrote:
 "clayasaurus" <clayasaurus gmail.com> wrote in message 
 news:dk3cit$klj$1 digitaldaemon.com...
 
does D have the c++ equivilent of #pragma pack(push,1), is it not needed 
with D, or just not implemented.
Can I get the D equivilent just by using the align attribute? Thanks.


 
 It's mostly not needed because of the better alignment support in D.  In 
 C++, the pack push and pop operations are needed because normally member 
 alignment is controlled by a command-line switch, so the pushing and popping 
 is so that changing the alignment for one struct doesn't change it for all 
 the rest.  But in D, to change the alignment for one struct, you just use 
 the very obvious syntax:
 
 align(1) struct Something
 {
     ...
 }
 
 And the alignment will stay the same (i.e. the default, or whatever you set 
 them to) on all the other structs in your program.

Oct 30 2005

clayasaurus <clayasaurus gmail.com> writes:

Another converting problem.. not sure if this one can be solved with D.

#define REGISTER_AS_REMOTE_PROCEDURE_CALL(networkObject, functionName) 
(networkObject)->RegisterAsRemoteProcedureCall((#functionName),(functionName))

I'm pretty sure #functionName turns it into a char*, while functionName 
is the function pointer itself.

Here's my conversion attempt

template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
{
    REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID, 
void function(char *input, int numberOfBitsOfData, PlayerID sender) 
functionName)
    {
       networkObject.RegisterAsRemoteProcedureCall(uniqueID , 
functionName); // line 480
    }
}

but I get

raknet/networktypes.d(480): found 'networkObject' when expecting ')'
raknet/networktypes.d(480): no identifier for declarator 
REGISTER_AS_REMOTE_PROCEDURE_CALL
raknet/networktypes.d(480): semicolon expected, not 'char'
raknet/networktypes.d(480): no identifier for declarator char*
raknet/networktypes.d(480): semicolon expected, not 'void'
raknet/networktypes.d(480): semicolon expected, not ')'
raknet/networktypes.d(480): Declaration expected, not ')'
raknet/networktypes.d(484): unrecognized declaration

Oct 30 2005

Derek Parnell <derek psych.ward> writes:

On Sun, 30 Oct 2005 22:53:51 -0500, clayasaurus wrote:

 Another converting problem.. not sure if this one can be solved with D.
 
 #define REGISTER_AS_REMOTE_PROCEDURE_CALL(networkObject, functionName) 
 (networkObject)->RegisterAsRemoteProcedureCall((#functionName),(functionName))
 
 I'm pretty sure #functionName turns it into a char*, while functionName 
 is the function pointer itself.
 
 Here's my conversion attempt
 
 template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
 {
     REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID, 
 void function(char *input, int numberOfBitsOfData, PlayerID sender) 



,  // <<<< NEEDS A COMMA ?

 functionName)
     {
        networkObject.RegisterAsRemoteProcedureCall(uniqueID , 
 functionName); // line 480
     }
 }



-- 
Derek
(skype: derek.j.parnell)
Melbourne, Australia
31/10/2005 2:58:53 PM

Oct 30 2005

clayasaurus <clayasaurus gmail.com> writes:

Derek Parnell wrote:
 On Sun, 30 Oct 2005 22:53:51 -0500, clayasaurus wrote:
 
 
Another converting problem.. not sure if this one can be solved with D.

#define REGISTER_AS_REMOTE_PROCEDURE_CALL(networkObject, functionName) 
(networkObject)->RegisterAsRemoteProcedureCall((#functionName),(functionName))

I'm pretty sure #functionName turns it into a char*, while functionName 
is the function pointer itself.

Here's my conversion attempt

template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
{
    REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID, 
void function(char *input, int numberOfBitsOfData, PlayerID sender) 


 
 
 ,  // <<<< NEEDS A COMMA ?



from the function pointer docs http://www.digitalmars.com/d/type.html , 
it uses

int function(int) fp;	// fp is pointer to a function

from there i assume

void function(char *input, int numberOfBitsOfData, PlayerID sender) 
functionName;

is valid. my logic then thinks the following should work...

void somefunc(void function(char *input, int numberOfBitsOfData, 
PlayerID sender) fp)
{
   fp(); // call fp
}

or should i try

typedef void function(char *input, int numberOfBitsOfData, PlayerID 
sender) fp;

void somefunc(fp funcName)
{
   funcName();
}

but I don't understand why I would need

void somefunc(void function(char *input, int numberOfBitsOfData, 
PlayerID sender), fp)
{
   fp();
}

*confused*

 
 
functionName)
    {
       networkObject.RegisterAsRemoteProcedureCall(uniqueID , 
functionName); // line 480
    }
}

Oct 30 2005

Derek Parnell <derek psych.ward> writes:

On Mon, 31 Oct 2005 14:59:39 +1100, Derek Parnell wrote:

 On Sun, 30 Oct 2005 22:53:51 -0500, clayasaurus wrote:
 
 Another converting problem.. not sure if this one can be solved with D.
 
 #define REGISTER_AS_REMOTE_PROCEDURE_CALL(networkObject, functionName) 
 (networkObject)->RegisterAsRemoteProcedureCall((#functionName),(functionName))
 
 I'm pretty sure #functionName turns it into a char*, while functionName 
 is the function pointer itself.
 
 Here's my conversion attempt
 
 template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
 {
     REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID, 
 void function(char *input, int numberOfBitsOfData, PlayerID sender) 


 ,  // <<<< NEEDS A COMMA ?
 


Sorry, I wasn't thinking ;-)

The function called "REGISTER_AS_REMOTE_PROCEDURE_CALL", inside the
template of the same name, needs to specify it return type.

For example, this compiles ...

template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
{
    void REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID,
void function(char *input, int numberOfBitsOfData, PlayerID sender)
functionName)
    {
       networkObject.RegisterAsRemoteProcedureCall(uniqueID , 
functionName); // line 480
    }
}

-- 
Derek
(skype: derek.j.parnell)
Melbourne, Australia
31/10/2005 3:14:18 PM

Oct 30 2005

clayasaurus <clayasaurus gmail.com> writes:

Derek Parnell wrote:
 On Mon, 31 Oct 2005 14:59:39 +1100, Derek Parnell wrote:
 
 
On Sun, 30 Oct 2005 22:53:51 -0500, clayasaurus wrote:


Another converting problem.. not sure if this one can be solved with D.

#define REGISTER_AS_REMOTE_PROCEDURE_CALL(networkObject, functionName) 
(networkObject)->RegisterAsRemoteProcedureCall((#functionName),(functionName))

I'm pretty sure #functionName turns it into a char*, while functionName 
is the function pointer itself.

Here's my conversion attempt

template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
{
    REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID, 
void function(char *input, int numberOfBitsOfData, PlayerID sender) 


,  // <<<< NEEDS A COMMA ?


 
 Sorry, I wasn't thinking ;-)
 


No prob.

 The function called "REGISTER_AS_REMOTE_PROCEDURE_CALL", inside the
 template of the same name, needs to specify it return type.
 
 For example, this compiles ...
 
 template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
 {
     void REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID,
 void function(char *input, int numberOfBitsOfData, PlayerID sender)
 functionName)
     {
        networkObject.RegisterAsRemoteProcedureCall(uniqueID , 
 functionName); // line 480
     }
 }
 


Ahh.. thanks. It is amazing how that got away from me. I meticulously 
plan and read docs and I forget a void *doh*

Oct 30 2005

clayasaurus <clayasaurus gmail.com> writes:

Derek Parnell wrote:
 On Mon, 31 Oct 2005 14:59:39 +1100, Derek Parnell wrote:
 
 
On Sun, 30 Oct 2005 22:53:51 -0500, clayasaurus wrote:


Another converting problem.. not sure if this one can be solved with D.

#define REGISTER_AS_REMOTE_PROCEDURE_CALL(networkObject, functionName) 
(networkObject)->RegisterAsRemoteProcedureCall((#functionName),(functionName))

I'm pretty sure #functionName turns it into a char*, while functionName 
is the function pointer itself.

Here's my conversion attempt

template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
{
    REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID, 
void function(char *input, int numberOfBitsOfData, PlayerID sender) 


,  // <<<< NEEDS A COMMA ?


 
 Sorry, I wasn't thinking ;-)
 
 The function called "REGISTER_AS_REMOTE_PROCEDURE_CALL", inside the
 template of the same name, needs to specify it return type.
 
 For example, this compiles ...
 
 template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
 {
     void REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* uniqueID,
 void function(char *input, int numberOfBitsOfData, PlayerID sender)
 functionName)
     {
        networkObject.RegisterAsRemoteProcedureCall(uniqueID , 
 functionName); // line 480
     }
 }
 


I might as well ask this longshot question while I'm at it.

Is it possible to convert functionName into a character string of the 
actual function name it is pointing to?

Oct 30 2005

Chris Sauls <ibisbasenji gmail.com> writes:

clayasaurus wrote:
 Derek Parnell wrote:
 
 On Mon, 31 Oct 2005 14:59:39 +1100, Derek Parnell wrote:


 On Sun, 30 Oct 2005 22:53:51 -0500, clayasaurus wrote:


 Another converting problem.. not sure if this one can be solved with D.

 #define REGISTER_AS_REMOTE_PROCEDURE_CALL(networkObject, 
 functionName) 
 (networkObject)->RegisterAsRemoteProcedureCall((#functionName),(functionName)) 


 I'm pretty sure #functionName turns it into a char*, while 
 functionName is the function pointer itself.

 Here's my conversion attempt

 template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
 {
    REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* 
 uniqueID, void function(char *input, int numberOfBitsOfData, 
 PlayerID sender) 



 ,  // <<<< NEEDS A COMMA ?



 Sorry, I wasn't thinking ;-)

 The function called "REGISTER_AS_REMOTE_PROCEDURE_CALL", inside the
 template of the same name, needs to specify it return type.

 For example, this compiles ...

 template REGISTER_AS_REMOTE_PROCEDURE_CALL(T)
 {
     void REGISTER_AS_REMOTE_PROCEDURE_CALL(T networkObject, char* 
 uniqueID,
 void function(char *input, int numberOfBitsOfData, PlayerID sender)
 functionName)
     {
        networkObject.RegisterAsRemoteProcedureCall(uniqueID , 
 functionName); // line 480
     }
 }


 I might as well ask this longshot question while I'm at it.
 
 Is it possible to convert functionName into a character string of the 
 actual function name it is pointing to?
 
 


Yet another argument in favor of a (standard) reflection mechanism for D.

-- Chris Sauls

Oct 30 2005

clayasaurus <clayasaurus gmail.com> writes:

It also appears that the = operator in D is not overloadable. Should I 
settle with a function called 'deepCopy()' ?

Oct 30 2005

"Regan Heath" <regan netwin.co.nz> writes:

On Mon, 31 Oct 2005 00:30:17 -0500, clayasaurus <clayasaurus gmail.com>  
wrote:
 It also appears that the = operator in D is not overloadable. Should I  
 settle with a function called 'deepCopy()' ?


I would call it "dup" as that is what arrays use for a deep copy.

Regan

Oct 30 2005

Bruno Medeiros <daiphoenixNO SPAMlycos.com> writes:

Regan Heath wrote:
 On Mon, 31 Oct 2005 00:30:17 -0500, clayasaurus <clayasaurus gmail.com>  
 wrote:
 
 It also appears that the = operator in D is not overloadable. Should 
 I  settle with a function called 'deepCopy()' ?


 
 I would call it "dup" as that is what arrays use for a deep copy.
 
 Regan


simple copy/duplication, which, if compared to object cloning/copying, 
would be 'equivalent' to shallow copying, not deep copying (but such 
comparision should not be made in the first place).

-- 
Bruno Medeiros - CS/E student
"Certain aspects of D are a pathway to many abilities some consider to 
be... unnatural."

Oct 31 2005

"Regan Heath" <regan netwin.co.nz> writes:

On Mon, 31 Oct 2005 15:14:15 +0000, Bruno Medeiros  
<daiphoenixNO SPAMlycos.com> wrote:
 Regan Heath wrote:
 On Mon, 31 Oct 2005 00:30:17 -0500, clayasaurus  
 <clayasaurus gmail.com>  wrote:

 It also appears that the = operator in D is not overloadable. Should  
 I  settle with a function called 'deepCopy()' ?


  Regan


 simple copy/duplication, which, if compared to object cloning/copying,  
 would be 'equivalent' to shallow copying, not deep copying (but such  
 comparision should not be made in the first place).


You're right, of course.

Regan

Oct 31 2005

"Walter Bright" <newshound digitalmars.com> writes:

"clayasaurus" <clayasaurus gmail.com> wrote in message
news:dk4a31$29c1$1 digitaldaemon.com...
 It also appears that the = operator in D is not overloadable. Should I
 settle with a function called 'deepCopy()' ?


One of the reasons '=' is not overloadable is because of endless confusion
over whether it should be a deep or a shallow copy. By all means, if you're
doing a deepCopy(), name it that!

Nov 02 2005

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