Opened 9 years ago
Closed 9 years ago
#9171 closed Feature Requests (fixed)
Boost.Type_Erasure should be move-aware regarding construction.
| Reported by: | Owned by: | Steven Watanabe | |
|---|---|---|---|
| Milestone: | To Be Determined | Component: | type_erasure |
| Version: | Boost 1.54.0 | Severity: | Problem |
| Keywords: | Cc: |
Description
boost::type_erasure::any does not perform move-construction of the contained object during construction of the encapsulating any due to boost::type_erasure::detail::storage's constructor template not using perfect forwarding. This is particularly a problem because it means that you cannot construct an any with a move-only type, which has come up in practice. Similarly, it would be nice to have a "make_any" function template that is able to do completely in-place construction of the contained object.
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I would also very much appreciate if the concept of move_constructible could be added to Boost.Type_Erasure. At least for C++11. However, maybe it is also possible to implement it for C++03, too, by using Boost.Move?
I actually found this (http://thread.gmane.org/gmane.comp.lib.boost.devel/243109) conversation between Christophe Henry and Steven Watanabe in which Christophe shows a possible implementation of move_constructible concept.
However, it does not seem to work (at least for GCC 4.8 with C++11 enabled).
(PS: In my special case I would like to type-erase a class which has a std::unique_ptr member.)