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digitalmars.D.announce - Re: serialization library - associative arrays ?

reply Daniel919 <Daniel919 web.de> writes:
 What it does not do/is missing:
 - exception safety / multithread safety
 - out-of-class/struct serialization methods (is it possible to check  
 whether a specific overload exists at compile time?)
 - static arrays need to be serialized with describe_staticarray (static  
 arrays can't be inout, so the general-purpose template method doesn't  
 work... is there a way around the problem?)
 - things I forgot right now


Hi, what about associative arrays ?
serialization\basicarchive.d(100): static assert  (0) is false, "describe
called  with unsupported type"
Dec 21 2006
next sibling parent reply "Christian Kamm" <kamm nospam.de> writes:
 Hi, what about associative arrays ?


They're not supported at the moment as I forgot about them.

Hm, is there a way to check if a template parameter is an associative  
array and to get the key and value type without relying on .keys and  
.values?

Cheers,
Christian
Dec 21 2006
next sibling parent reply BCS <BCS pathlink.com> writes:
Christian Kamm wrote:

 Hi, what about associative arrays ?


 
 
 They're not supported at the moment as I forgot about them.
 
 Hm, is there a way to check if a template parameter is an associative  
 array and to get the key and value type without relying on .keys and  
 ..values?
 
 Cheers,
 Christian



static if(is(A in B))

??? IIRC in only works with AAs
Dec 21 2006
parent Lars Ivar Igesund <larsivar igesund.net> writes:
BCS wrote:


 Christian Kamm wrote:

 Hi, what about associative arrays ?


 
 
 They're not supported at the moment as I forgot about them.
 
 Hm, is there a way to check if a template parameter is an associative
 array and to get the key and value type without relying on .keys and
 ..values?
 
 Cheers,
 Christian


 
 
 static if(is(A in B))
 
 ??? IIRC in only works with AAs


opIn is overloadable.

-- 
Lars Ivar Igesund
blog at http://larsivi.net
DSource & #D: larsivi
Dec 21 2006
prev sibling parent reply "Christian Kamm" <kamm nospam.de> writes:
 Hm, is there a way to check if a template parameter is an associative =


 =


 array and to get the key and value type without relying on .keys and  =



 .values?


What I'm planning on using is:

static if(
   !is(T =3D=3D struct) &&
   !is(T =3D=3D class) &&
   is(typeof(T.keys) KEY =3D=3D KEY[]) &&
   is(typeof(T.values) VALUE =3D=3D VALUE[])
)
{
   // static assert( is(T =3D=3D VALUE[KEY]) );
}

It seems to work, but is rather clumsy.

Christian
Dec 21 2006
parent reply Thomas Kuehne <thomas-dloop kuehne.cn> writes:
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Christian Kamm schrieb am 2006-12-21:

 Hm, is there a way to check if a template parameter is an associative  
 array and to get the key and value type without relying on .keys and  
 .values?


 What I'm planning on using is:

 static if(
    !is(T == struct) &&
    !is(T == class) &&
    is(typeof(T.keys) KEY == KEY[]) &&
    is(typeof(T.values) VALUE == VALUE[])
 )
 {
    // static assert( is(T == VALUE[KEY]) );
 }

 It seems to work, but is rather clumsy.


static if(is(T == typeof(T.values[$])[typeof(T.keys[$])]){
	// it is an AA, now do your KEY and VALUE magic
}

Thomas

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Dec 21 2006
parent reply "Christian Kamm" <kamm nospam.de> writes:
 static if(is(T =3D=3D typeof(T.values[$])[typeof(T.keys[$])]){
 	// it is an AA, now do your KEY and VALUE magic
 }


Good idea! However, it doesn't compile for T =3D int, for example (unles=
s  =

that was changed between 0.173 and 0.177):
- no property 'keys' for type 'int'

Why is T.values[$] allowed, though - and is the [$] neccessary? I've so =
 =

far relied on typeof returning the type of the return value for function=
s,  =

but couldn't find it in the spec. Maybe it would be best to use  =

is(T.values VALUE =3D=3D return)?

Christian
Dec 21 2006
parent Thomas Kuehne <thomas-dloop kuehne.cn> writes:
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Christian Kamm schrieb am 2006-12-21:

 static if(is(T == typeof(T.values[$])[typeof(T.keys[$])]){
 	// it is an AA, now do your KEY and VALUE magic
 }


 Good idea! However, it doesn't compile for T = int, for example (unless  
 that was changed between 0.173 and 0.177):
 - no property 'keys' for type 'int'


Wrong order..., this should work:

static if(is(typeof(T.values[0])[typeof(T.keys[0])] == T)){
 	// it is an AA, now do your KEY and VALUE magic
}



 Why is T.values[$] allowed, though - and is the [$] neccessary?


$ is used to get an element of the array. You can use any index for that
purpose.

Thomas


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Dec 21 2006
prev sibling parent "Christian Kamm" <kamm nospam.de> writes:
 Hi, what about associative arrays ?


Added support for associative arrays:
http://www.math.tu-berlin.de/~kamm/d/serialization.zip

I only did a very small unittest for testing the new functionality, so  
please report further problems and bugs to kamm 'replace with at'  
math.tu-berlin.de instead of the newsgroup.

I've also asked Brad for a project on dsource; once it's set up, further  
updates will go into the repository there.

Christian
Dec 22 2006