CODEWITHSUNDEEP
visual-studio-2008c++-cli
user3508140
user3508140

Reputation: 285

Error: illegal use of this type as an expression. list in vc++

i m trying to make a project that requires the use of list.i cant seem to get it to work. following is my code:

ref class MyClass2
{
    public:
        int x;
        String^ str;
}
List<MyClass2> lst =gcnew List<MyClass2>(); //here is the error

I am working in visual studio 2008.

Upvotes: 2

Views: 80

Answers (2)

crashmstr
crashmstr

Reputation: 28563

You need this (note the three total ^ used):

List<MyClass2^>^ lst =gcnew List<MyClass2^>();

This is because MyClass2 is a reference type and can only be used with MyClass2^ and allocated with gcnew (just like List).

Thus you have a reference to a List that can contain references to MyClass2.

Then, to add items:

MyClass2^ mc = gcnew MyClass2();
mc->x = 2; //Set values
lst->Add(mc);

Upvotes: 1

BradleyDotNET
BradleyDotNET

Reputation: 61339

gcnew returns a reference. You can't just assign it to an object. Also, you are storing references, not objects. Thus, just do this:

List<MyClass2^>^ lst = gcnew List<MyClass2^>(); //note what I'm assigning to

Similarly, with standard new you have to use pointers.

Upvotes: 0

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