Usages of a SortedList

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Prez - 12 Jul 2006 21:56 GMT

I started writing .net code yesterday and I am grasping it well enough.

I have a few questions about SortedLists.

I am using managed C++ if that makes any difference.

Of the examples I have seen it looks like the Sorted List does not use
the ^ while other variables do use the ^. I have used the SortedList
with the ^ and gcnew and it seems to work fine. So the question is...
Why can I get away without using the ^ ?

My second question is whether I can type the values in the sorted list.

While it is great that the sortedlist can hold any type of data item
sometimes I want it to just hold instances of a class. For example in
the world of C++ can I take a CMap<int, int, CMyClass, CMyClass> and
turn it into a SortedList of just CMyClass.

My third question. Is there an easier way to get a value based upon
key from a SortedList. I don't see a function that explicitly does it.

Here is the code I am looking at using. Was just looking for
something easier. Note that I am using IndexOfKey to get the index
value to use GetByIndex. Is there a GetbyKey function?

CTemperatureItem ^ TempItem = safe_cast<CTemperatureItem
^>(m_LocationInfo->GetByIndex(m_LocationInfo->IndexOfKey(Location)));

I don't need a long drawn out explanation. Just a quick message should

fit the bill.

Thanks!

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Vinzenz Feenstra - 15 Jul 2006 11:19 GMT

Vinzenz Feenstra
ewido anti-spyware development team

Antimalware Development a.s.
a Member of Grisoft Group

Contact | vinzenz.feenstra@ewido.net |

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Hi Prez,

Prez schrieb:

> I started writing .net code yesterday and I am grasping it well enough.
>
[quoted text clipped - 6 lines]
> with the ^ and gcnew and it seems to work fine. So the question is...
> Why can I get away without using the ^ ?

I don't know what exactly you mean, you need to use a (managed)
Reference to an Object. Take a look at the example I have added at the end.

> My second question is whether I can type the values in the sorted list.
>
> While it is great that the sortedlist can hold any type of data item
> sometimes I want it to just hold instances of a class. For example in
> the world of C++ can I take a CMap<int, int, CMyClass, CMyClass> and
> turn it into a SortedList of just CMyClass.

Use the Generic Version of SortedList ;) (Also here take a look at the
example)

> My third question. Is there an easier way to get a value based upon
> key from a SortedList. I don't see a function that explicitly does it.
>
> Here is the code I am looking at using. Was just looking for
> something easier. Note that I am using IndexOfKey to get the index
> value to use GetByIndex. Is there a GetbyKey function?

You may use the Indexer of the SortedList. It's like the operator[] in
C++ ;)

[snip]
using namespace System;
using namespace System::Collections;
using namespace System::Collections;

// A test structure
public ref struct Test{
int SomeValue;
String ^SomeString;
};

// An example for the usage of a non generic SortedList
void NonGenericUsage(){
SortedList a_list;

Test t;
t.SomeString = "A non generic SortedList value";
t.SomeValue = 1234;

a_list.Add("Test",%t);

Console::WriteLine(dynamic_cast<Test^>(a_list["Test"])->SomeValue);
Console::WriteLine(dynamic_cast<Test^>(a_list["Test"])->SomeString);
}

// An example for the usage of a generic SortedList
void GenericUsage(){
Generic::SortedList<String^,Test^> a_list;

Test t;
t.SomeString = "A generic SortedList<KeyType,ValueType> value";
t.SomeValue = 4321;

a_list.Add("Test",%t);

Console::WriteLine(a_list["Test"]->SomeValue);
Console::WriteLine(a_list["Test"]->SomeString);
};

int main(array<System::String ^> ^args){
Console::WriteLine("Non generic SortedList example:\n");
NonGenericUsage();
Console::WriteLine("\n\nGeneric SortedList<> example:\n");
GenericUsage();
return 0;
}
[/snip]

Regards,

Vinzenz Feenstra

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Vinzenz Feenstra - 15 Jul 2006 11:24 GMT

OOps, I've accidently added my signature from my job account. I'm sorry.

Regards,

Vinzenz Feenstra

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Usages of a SortedList

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