Re: [Boost-users] [mpl] possible bug in insert<set, x>

Geoffrey Romer writes:

On 10/7/05, Geoffrey Romer wrote:

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I'm having trouble with insert<> as called on a set. Specifically, it doesn't seem to be possible to iterate over sets built with insert<>. The following code, for example, works correctly (or at least, compiles without errors):

--- typedef set m_set; typedef transform > >::type result; ^^^^^^^^^^^^^^^^^^^^^ identity<_1>

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but the following (which as I understand it should be equivalent) fails to compile:

--- typedef insert, double>::type, char>::type m_set; typedef transform > >::type result; ^^^^^^^^^^^^^^^^^^^^^ identity<_1>

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On the assumption that this is a bug,

It is, thanks for the report.

or at least a non-obvious usage error, can anyone suggest a workaround?

Try this: typedef insert, double>::type, char>::type m_set; ^^^^^^ typedef transform >::type result;

At present I can find no way to insert an item into a set in a way that produces a usable set, and this is a major obstacle in the project I'm working on.

Also, is boost or boost-users the preferred forum for these sorts of questions? boost-users seems more appropriate (since this may, after all, be an error on my part), but I've found boost to be much more responsive.

As far as MPL is concerned, there is no intentional discrimination of them on my side, but I think the developers list definitely has more readers that would be able to comment on the library problems of similar nature, and your posts would be well appropriate there. -- Aleksey Gurtovoy MetaCommunications Engineering