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    <p>You cannot specify initialisers for non-<code>static</code> members that way -- you would normally need to declare the array and then populate it inside the constructor... Except that, in fact there is no way to initialise <code>const</code> member arrays in C++ (see <a href="https://stackoverflow.com/questions/161790/initialize-a-const-array-in-a-class-initializer-in-c">this thread</a>).</p> <p>If you are prepared to share <code>MainMessages</code> amongst all instances of <code>CScrollingListDlg</code> (which I suspect was your intention all along), you should make it <code>static</code>, in which case you can declare:</p> <pre><code>static const decodeUINT MainMessages[]; // "struct" keyword unnecessary </code></pre> <p>inside the class definition of <code>CScrollingListDlg</code>, and then define it outside the class:</p> <pre><code>const CScrollingListDlg::decodeUINT CScrollingListDlg::MainMessages[] = { WM_PAINT, DoPaintMain, WM_DESTROY, DoDestroyMain, WM_QUIT, DoDestroyMain, WM_COMMAND, DoCommandMain, // The comma *is* allowed -- thanks Josh! }; </code></pre> <p>In order for this to actually compile, you'll need to make <code>DoPaintMain()</code>, <code>DoDestroyMain()</code>, etc. <code>static</code> as well -- as it stands, they are all per-object methods that implicitly take a <code>this</code> pointer, so they can't actually be contained in a function pointer of type <code>LRESULT (*Fxn)(HWND, UINT, WPARAM, LPARAM)</code>. (You could leave them as non-static methods and change the pointer type in <code>decodeUINT</code> to a pointer-to-member-function type, but that's probably not what you want.)</p> <p><strong>[EDIT: Thanks to Josh for some helpful comments!]</strong></p>
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    1. CO+1 Beat me to it, (although you do need to add [] to the array definition: const CScrollingListDlg::decodeUINT CScrollingListDlg::MainMessages[] = { ...
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    2. COThe superfluous comma is allowed (initializer-clause is defined as an initializer-list followed by an optional comma) and for good reason: when you add a new line to a list in an array like this or an enum, you only change one line. If you leave off the final comma, you'll end up changing two line in source control every time you add a new item. It's just clearer when looking at diffs if only the interesting line changes.
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    3. CO@Josh: Both good points. Didn't know about the trailing comma being allowed, thanks!
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