nsCString::Left( nsACString& aResult, size_type aLengthToCopy ) const { return Mid(aResult, 0, aLengthToCopy); }
PRUint32 nsCString::Left(nsCString& aDest,PRInt32 aCount) const{ if(aCount<0) aCount=mLength; else aCount=MinInt(aCount,mLength); StrAssign(aDest,*this,0,aCount); return aDest.mLength; }
nsCString::Left( nsACString& aResult, size_type aLengthToCopy ) const  {    return Mid(aResult, 0, aLengthToCopy);  }