core: rename has_vptr_fn to has_adl_vptr

[jll63]

(Written by Claude Code, on behalf of @jll63.)

Renames detail::has_vptr_fn to detail::has_adl_vptr. No behaviour change.

core.hpp has two traits next to each other that look like duplicates, and are not:

	has_adl_vptr<Class, Registry> (was has_vptr_fn)	has_vptr<Traits, Arg>
detects	boost_openmethod_vptr(const Class&, Registry*), found by ADL	a static member Traits::vptr(arg) of virtual_traits
provided by	the class: inplace_vptr_base, or the openmethod_vptr type-erasure concept	the parameter's traits: std::any, boost::any, type_erasure::any, virtual_any
yields	the v-table pointer, by value	a reference to one

Each covers types the other cannot: std::any lives in namespace std, where no ADL overload can be added. And acquire_vptr treats them in opposite ways, rejecting the hook and using the traits member, because a by-value pointer cannot be stored by an indirect registry.

The old name read as "has a vptr function", which describes both. The adl_ prefix follows adl_affinity, the library's other ADL customization point. Neither trait had a comment; both now say what they detect.

Ordering with #127: that PR adds a use of the old name in init_bad_call. A textual merge of the two is clean, but the result would not compile, and GitHub would not notice. feature/dll therefore merges this branch and renames its own use, so the two PRs can land in either order.

Verified locally: CMake with clang-22, 198/198; b2 with gcc (-Wextra -Werror), 128 passed, no warnings.

🤖 Generated with Claude Code

[cppalliance-bot]

An automated preview of the documentation is available at https://131.openmethod.prtest3.cppalliance.org/libs/openmethod/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-10-17 15:37:40 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.34%. Comparing base (1137590) to head (5356efb).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #131   +/-   ##
========================================
  Coverage    92.34%   92.34%           
========================================
  Files           27       27           
  Lines         2234     2234           
  Branches       677      677           
========================================
  Hits          2063     2063           
  Misses         112      112           
  Partials        59       59           

Files with missing lines	Coverage Δ
include/boost/openmethod/core.hpp	91.80% <ø> (ø)

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