work around MrDocs bug wrt macros in requirements

Author: jll63

include/boost/openmethod/core.hpp

@@ -1214,7 +1214,7 @@ class virtual_ptr<
               detail::box_vptr<use_indirect_vptrs>(detail::null_vptr))),
           obj(std::move(other.obj)) {
     }
-
+#ifdef __MRDOCS__
     //! Construct from a (const) smart pointer to a derived class
     //!
     //! Set the object pointer with a copy of `other`. Set the v-table pointer
@@ -1243,18 +1243,25 @@ class virtual_ptr<
     template<
         class Other,
         typename = std::enable_if_t<
-            BOOST_OPENMETHOD_DETAIL_UNLESS_MRDOCS
-                SameSmartPtr<SmartPtr, Other, Registry> &&
-            BOOST_OPENMETHOD_DETAIL_UNLESS_MRDOCS
-                IsPolymorphic<typename Other::element_type, Registry> &&
+            SameSmartPtr<SmartPtr, Other, Registry> &&
+            IsPolymorphic<typename Other::element_type, Registry> &&
             std::is_constructible_v<SmartPtr, const Other&>>>
+#else
+    template<
+        class Other,
+        typename = std::enable_if_t<
+            detail::SameSmartPtr<SmartPtr, Other, Registry> &&
+            detail::IsPolymorphic<typename Other::element_type, Registry> &&
+            std::is_constructible_v<SmartPtr, const Other&>>>
+#endif
     virtual_ptr(const Other& other)
         : vp(detail::box_vptr<use_indirect_vptrs>(
               other ? detail::acquire_vptr<Registry>(*other)
                     : detail::null_vptr)),
           obj(other) {
     }
 
+#if __MRDOCS__
     //! Construct from a smart pointer to a derived class
     //!
     //! Copy object pointer from `other` to `this`. Set the v-table pointer
@@ -1283,18 +1290,25 @@ class virtual_ptr<
     template<
         class Other,
         typename = std::enable_if_t<
-            BOOST_OPENMETHOD_DETAIL_UNLESS_MRDOCS
-                SameSmartPtr<SmartPtr, Other, Registry> &&
-            BOOST_OPENMETHOD_DETAIL_UNLESS_MRDOCS
-                IsPolymorphic<typename Other::element_type, Registry> &&
+            SameSmartPtr<SmartPtr, Other, Registry> &&
+            IsPolymorphic<typename Other::element_type, Registry> &&
+            std::is_constructible_v<SmartPtr, Other&>>>
+#else
+    template<
+        class Other,
+        typename = std::enable_if_t<
+            detail::SameSmartPtr<SmartPtr, Other, Registry> &&
+            detail::IsPolymorphic<typename Other::element_type, Registry> &&
             std::is_constructible_v<SmartPtr, Other&>>>
+#endif
     virtual_ptr(Other& other)
         : vp(detail::box_vptr<use_indirect_vptrs>(
               other ? detail::acquire_vptr<Registry>(*other)
                     : detail::null_vptr)),
           obj(other) {
     }
 
+#ifdef __MRDOCS__
     //! Move-construct from a smart pointer to a derived class
     //!
     //! Move object pointer from `other` to `this`. Set the v-table pointer
@@ -1326,11 +1340,17 @@ class virtual_ptr<
     template<
         class Other,
         typename = std::enable_if_t<
-            BOOST_OPENMETHOD_DETAIL_UNLESS_MRDOCS
-                SameSmartPtr<SmartPtr, Other, Registry> &&
-            BOOST_OPENMETHOD_DETAIL_UNLESS_MRDOCS
-                IsPolymorphic<typename Other::element_type, Registry> &&
+            SameSmartPtr<SmartPtr, Other, Registry> &&
+            IsPolymorphic<typename Other::element_type, Registry> &&
             std::is_constructible_v<SmartPtr, Other&&>>>
+#else
+    template<
+        class Other,
+        typename = std::enable_if_t<
+            detail::SameSmartPtr<SmartPtr, Other, Registry> &&
+            detail::IsPolymorphic<typename Other::element_type, Registry> &&
+            std::is_constructible_v<SmartPtr, Other&&>>>
+#endif
     virtual_ptr(Other&& other)
         : vp(detail::box_vptr<use_indirect_vptrs>(
               other ? detail::acquire_vptr<Registry>(*other)