Feature request: constructor and resize from values

Hello, this is a copy of my email I sent to the boost-users mailing list, as it might improve visibility.

I'd love to be able to use multi_array with classes that do not have a default constructor. At the moment, this is impossible, as both the constructor and resize functions only take extents as arguments (and possibly some other options), but no value_type, as for example std::vector does. Thus, trying to store objects without a default constructor in a multi_array results in hard compiler errors, with no workaround that I know of.

This happens to me fairly often, as I use multi_array to organize sets of complex objects. If there is a technical reason why this is not possible, I would also be happy to learn it.

Start by locating the multi_array constructor and resize APIs described in the issue, then inspect how they currently initialize elements and how std::vector accepts a value. Determine the supported design for supplying a value_type when creating or resizing an array. Done means non-default-constructible classes can be stored without hard compiler errors and existing extent-based behavior remains supported.

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