C++/Cli literal Array Initialization

Question

I'm trying to create a constant array in managed c++ and am getting stuck. I've searched around but haven't come across any good examples of how to do this.

What I'd like is the equivalent of:

const unsigned char myConstArray = {1,2,3,4,5,6};

Right now I'm staring at this:

literal array<Byte>^ myConstArray = gcnew array<Byte> { 1,2,3,4,5,6};

Which I gather is not right, since Visual Studio complains that I cannot use gcnew in a constant expression. Not sure where to go here, any help would be appreciated.

Cheers,

David

t3chb0t · Accepted Answer · 2016-11-07 20:38:23Z

3

It will not work with the literal like that because:

A data member marked as literal must be initialized when declared and the value must be a constant integral, enum, or string type. Conversion from the type of the initialization expression to the type of the static const data-member must not require a user-defined conversion.

literal (C++ Component Extensions)

...however it is quite strange that literal is an an equivalent of static const but by using static const it compiles without errors.

Creating a read-only property is another way you could return the array:

ref class Test1 {
public:
    Test1() {
        myArray = gcnew cli::array<Byte> { 1, 2, 3, 4, 5, 6};
    }

    property cli::array<Byte>^ MyArray {
        cli::array<Byte>^ get() {
            return myArray;
        };  
    }

private:

    cli::array<Byte>^ myArray;

};

edited Nov 7, 2016 at 20:38

answered Dec 5, 2014 at 20:22

t3chb0t

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3 Comments

Fratink Over a year ago

Hmm.. If I change it to static const I instead get warnings of "const/volatile qualifiers on this type are not supported". It does get past this point in compilation now. I suppose I can just make a regular array, make it private, and hope it doesn't get overwritten if there's no other way of doing this.

Fratink Over a year ago

I hadn't thought of that! Thanks!

Fratink Over a year ago

Worked great, and it actually simplified things a fair bit. Thanks again!

West · Accepted Answer · 2014-12-05 21:37:17Z

0

std::initializer_list<unsigned char>>({1, 2, 3,4,5,6};

I'm not sure if this applies to managed C++ but initializer lists are a C++11 construct that is inherently const and allows begin and end semantics to be applied but not array indexing. so as long as a ranged based for will work you can use this array.

edited Dec 5, 2014 at 21:37

answered Dec 5, 2014 at 20:23

West

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1 Comment

Josh Burgess Over a year ago

Please explain what this block of code is. Right now, it's not very useful as an answer and in danger of deletion.

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