From bbbf1ca0e4c44debcaa31d0b7dc361b5fcf077f0 Mon Sep 17 00:00:00 2001
From: Mingxin Wang <mingxwa@outlook.com>
Date: Fri, 25 Sep 2026 15:40:27 +0800
Subject: [PATCH] Drop the unused Nullable parameter of the conversion accessor

cast_dispatch_base took a Nullable parameter so that the accessor of
substitution_dispatch could convert an empty proxy to an empty proxy
without invoking the dispatch. substitution_dispatch has been gone
since #84, and both remaining users, implicit_conversion_dispatch and
explicit_conversion_dispatch, pass false, so the branch it guarded was
never instantiated.
---
 include/proxy/v5/detail/core.h     | 7 +------
 include/proxy/v5/detail/dispatch.h | 4 ++--
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/include/proxy/v5/detail/core.h b/include/proxy/v5/detail/core.h
index 0a25174..e2b7f67 100644
--- a/include/proxy/v5/detail/core.h
+++ b/include/proxy/v5/detail/core.h
@@ -1567,15 +1567,10 @@ struct converter {
   struct accessor<P, D, T() oq ne> {                                           \
     PRO5D_GEN_DEBUG_SYMBOL_FOR_MEM_ACCESSOR(operator T)                        \
     explicit(Expl) operator T() oq ne {                                        \
-      if constexpr (Nullable) {                                                \
-        if (!static_cast<const P&>(*this).has_value()) {                       \
-          return nullptr;                                                      \
-        }                                                                      \
-      }                                                                        \
       return invoke<D, T() oq ne>(static_cast<P pq>(*this));                   \
     }                                                                          \
   }
-template <bool Expl, bool Nullable>
+template <bool Expl>
 struct cast_dispatch_base {
   PRO5D_DEF_ACCESSOR_TEMPLATE(
       MEM, PRO5D_DEF_CAST_ACCESSOR,
diff --git a/include/proxy/v5/detail/dispatch.h b/include/proxy/v5/detail/dispatch.h
index 98dc5c3..771676b 100644
--- a/include/proxy/v5/detail/dispatch.h
+++ b/include/proxy/v5/detail/dispatch.h
@@ -264,13 +264,13 @@ struct operator_dispatch<"[]", false> {
 #undef PRO5D_DEF_LHS_UNARY_OP_ACCESSOR
 #undef PRO5D_DEF_LHS_LEFT_OP_ACCESSOR
 
-struct implicit_conversion_dispatch : detail::cast_dispatch_base<false, false> {
+struct implicit_conversion_dispatch : detail::cast_dispatch_base<false> {
   template <class T>
   PRO5D_STATIC_CALL(T&&, T&& self) noexcept {
     return std::forward<T>(self);
   }
 };
-struct explicit_conversion_dispatch : detail::cast_dispatch_base<true, false> {
+struct explicit_conversion_dispatch : detail::cast_dispatch_base<true> {
   template <class T>
   PRO5D_STATIC_CALL(auto, T&& self) noexcept {
     return detail::converter{