重载opIndexAssign

Question

我似乎在我的一个类中重载opIndexAssign时遇到了一些麻烦.

我上课了; JSObject的定义如下:

alias char[] String;

...

class JSObject : Dobject
{
    /*****************************************************************
    * Constructors
    ******************************************************************/
    this( Dobject dobj )
    {
        super( dobj ) ;
    }

    this()
    {
        super( null ) ;
    }

    this( AssociativeArray data )
    {
        // initiate
        super( null ) ;

        // then populate
        foreach( k, v ; data )
        {
            this[ k ] = v ;
        }
    }

    public void opIndexAssign( String key , String val )
    {
        Value* v = new Value() ;
        v.putVstring( val ) ;
        this.Put(key, v , DontDelete);
    }

    public void opIndexAssign( String key , Dobject dobj )
    {
        Value* v = new Value() ;
        v.putVobject( dobj ) ;
        this.Put(key, v , DontDelete);
    }

    public void opIndexAssign( String key , JSObject jso )
    {
        Value* v = new Value() ;
        v.putVobject( jso ) ;
        this.Put(key, v , DontDelete);
    }

    public Value* opIndex( String key )
    {
        return this.Get( key ); 
    }

}

Dobject超类重载了put()和get()方法,我试图将它们包装起来,以便我可以将它们作为关联数组访问:

77: JSObject jso = new JSObject() ;
78: jso[ "foo" ] = "bar" ;
79: 
80: JSObject jsoParent = new JSObject() ;
81: jsoParent[ "child" ] = jso ;

它适用于String,String方法但是当我尝试使用JSObject作为值时,它会失败.

test2.d => test2
+ c:\dmd\dsss\bin\rebuild.exe -version=PhobosCompatibility -w  -Idsss_imports\ -I. -S.\ -Ic:\dmd\dsss\include\d -Sc:\dmd\dsss\lib\ -Ic:\dmd\dsss\include\d -Sc:\dmd\dsss\lib  -oqdsss_objs\D  -debug -gc test2.d -oftest2 
test2.d(81): Error: function dmdscripttest.JSObject.opIndexAssign (char[],char[]) does not match parameter types (JSObject,char[5u])
test2.d(81): Error: cannot implicitly convert expression (jso) of type dmdscripttest.JSObject to char[]
test2.d(81): Error: cannot implicitly convert expression ("child") of type char[5u] to dmdscripttest.JSObject
Error: Command failed, aborting.
Command c:\dmd\dsss\bin\rebuild.exe returned with code 1, aborting.

我有点不知所措.这就像编译器试图将其转换为适合opIndexAssign(String,String)而不是opIndexAssign(String,JSObject)方法.

我是否错误地定义了opIndexAssign函数？

提前致谢,

Answer 1

问题是opIndexAssigne首先需要值,然后需要键(或索引)

http://www.d-programming-language.org/operatoroverloading.html#Assignment

所以你要把它定义为

public void opIndexAssign(  String val , String key)
{
    Value* v = new Value() ;
    v.putVstring( val ) ;
    this.Put(key, v , DontDelete);
}

public void opIndexAssign( Dobject dobj , String key)
{
    Value* v = new Value() ;
    v.putVobject( dobj ) ;
    this.Put(key, v , DontDelete);
}

public void opIndexAssign( JSObject jso , String key)
{
    Value* v = new Value() ;
    v.putVobject( jso ) ;
    this.Put(key, v , DontDelete);
}

这样做的原因是你可以为索引定义一个vararg