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Unable to use boost::multi_index::tag in module interface #85
Description
When trying to use boost::multi_index::tag in the implementation of the interface part of a C++20 module, I get a GCC error that the boost part uses internal linkage. Here's a reproducible example: https://godbolt.org/z/5e7KWj8qz
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d7d1cd commentedon Oct 14, 2025
The problem is that the boost::mpl::aux::ptr_to_ref function template is declared as static. Is there a reason for this, or is it just a bug?
vinniefalco commentedon Oct 15, 2025
Someone is still using MPL ?
d7d1cd commentedon Oct 16, 2025
Boost itself uses MPL in its implementation of multi_index::tag
d7d1cd commentedon Oct 16, 2025
To solve the problem, I made a PR boostorg/mpl#90