From a41060227fe485f380423a9b31b4f2af03395ba2 Mon Sep 17 00:00:00 2001
From: Eisuke Kawashima <e-kwsm@users.noreply.github.com>
Date: Sat, 18 Jan 2025 05:28:56 +0900
Subject: [PATCH] refactor: use BOOST_STATIC_ASSERT

---
 include/boost/python/args_fwd.hpp              |  4 +++-
 include/boost/python/cast.hpp                  |  4 +++-
 include/boost/python/class.hpp                 |  6 ++++--
 include/boost/python/def.hpp                   |  6 +++---
 include/boost/python/detail/defaults_gen.hpp   |  9 +++------
 include/boost/python/init.hpp                  | 12 +++++-------
 include/boost/python/make_constructor.hpp      |  5 ++---
 include/boost/python/make_function.hpp         |  5 ++---
 include/boost/python/object/pickle_support.hpp |  6 +++---
 9 files changed, 28 insertions(+), 29 deletions(-)

diff --git a/include/boost/python/args_fwd.hpp b/include/boost/python/args_fwd.hpp
index 39239461b0..6394ef7a41 100644
--- a/include/boost/python/args_fwd.hpp
+++ b/include/boost/python/args_fwd.hpp
@@ -9,6 +9,7 @@
 
 # include <boost/python/handle.hpp>
 # include <boost/config.hpp>
+# include <boost/static_assert.hpp>
 # include <cstddef>
 # include <utility>
 
@@ -39,10 +40,11 @@ namespace detail
 
   namespace error
   {
+    /// @deprecated
     template <int keywords, int function_args>
     struct more_keywords_than_function_arguments
     {
-        typedef char too_many_keywords[keywords > function_args ? -1 : 1];
+        BOOST_STATIC_ASSERT(keywords <= function_args);
     };
   }
 }
diff --git a/include/boost/python/cast.hpp b/include/boost/python/cast.hpp
index c0dd229e84..6da72c36d9 100644
--- a/include/boost/python/cast.hpp
+++ b/include/boost/python/cast.hpp
@@ -12,6 +12,8 @@
 # include <boost/python/base_type_traits.hpp>
 # include <boost/python/detail/convertible.hpp>
 
+# include <boost/static_assert.hpp>
+
 namespace boost { namespace python { 
 
 namespace detail
@@ -69,7 +71,7 @@ namespace detail
   template <class T>
   inline void assert_castable(boost::type<T>* = 0)
   {
-      typedef char must_be_a_complete_type[sizeof(T)] BOOST_ATTRIBUTE_UNUSED;
+      BOOST_STATIC_ASSERT(sizeof(T));
   }
 
   template <class Source, class Target>
diff --git a/include/boost/python/class.hpp b/include/boost/python/class.hpp
index 0f1c0fdc1a..db7792dea5 100644
--- a/include/boost/python/class.hpp
+++ b/include/boost/python/class.hpp
@@ -32,6 +32,8 @@
 # include <boost/python/detail/unwrap_type_id.hpp>
 # include <boost/python/detail/unwrap_wrapper.hpp>
 
+# include <boost/static_assert.hpp>
+
 # include <boost/mpl/size.hpp>
 # include <boost/mpl/for_each.hpp>
 # include <boost/mpl/bool.hpp>
@@ -136,9 +138,9 @@ namespace detail
             // https://svn.boost.org/trac/boost/ticket/5803
             //typedef typename assertion<mpl::not_<detail::is_same<Default,Fn> > >::failed test0;
 # if !BOOST_WORKAROUND(__MWERKS__, <= 0x2407)
-            typedef typename assertion<detail::is_polymorphic<T> >::failed test1 BOOST_ATTRIBUTE_UNUSED;
+            BOOST_STATIC_ASSERT(detail::is_polymorphic<T>::value);
 # endif 
-            typedef typename assertion<detail::is_member_function_pointer<Fn> >::failed test2 BOOST_ATTRIBUTE_UNUSED;
+            BOOST_STATIC_ASSERT(detail::is_member_function_pointer<Fn>::value);
             not_a_derived_class_member<Default>(Fn());
         }
     };
diff --git a/include/boost/python/def.hpp b/include/boost/python/def.hpp
index fe2c65f938..96e1f4b53e 100644
--- a/include/boost/python/def.hpp
+++ b/include/boost/python/def.hpp
@@ -15,6 +15,8 @@
 # include <boost/python/signature.hpp>
 # include <boost/python/detail/scope.hpp>
 
+# include <boost/static_assert.hpp>
+
 namespace boost { namespace python {
 
 namespace detail
@@ -35,9 +37,7 @@ namespace detail
       char const* name, F const& fn, Helper const& helper)
   {
       // Must not try to use default implementations except with method definitions.
-      typedef typename error::multiple_functions_passed_to_def<
-          Helper::has_default_implementation
-          >::type assertion BOOST_ATTRIBUTE_UNUSED;
+      BOOST_STATIC_ASSERT(!Helper::has_default_implementation);
       
       detail::scope_setattr_doc(
           name, boost::python::make_function(
diff --git a/include/boost/python/detail/defaults_gen.hpp b/include/boost/python/detail/defaults_gen.hpp
index 88beeedb02..ae2f69c33b 100644
--- a/include/boost/python/detail/defaults_gen.hpp
+++ b/include/boost/python/detail/defaults_gen.hpp
@@ -26,6 +26,7 @@
 #include <boost/mpl/begin_end.hpp>
 #include <boost/mpl/next.hpp>
 #include <boost/mpl/deref.hpp>
+#include <boost/static_assert.hpp>
 #include <cstddef>
 
 namespace boost { namespace python {
@@ -211,18 +212,14 @@ namespace detail
         : ::boost::python::detail::overloads_common<fstubs_name>(                           \
             doc, keywords.range())                                                          \
     {                                                                                       \
-        typedef typename ::boost::python::detail::                                          \
-            error::more_keywords_than_function_arguments<                                   \
-                N,n_args>::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED;              \
+        BOOST_STATIC_ASSERT(N <= n_args);                                                   \
     }                                                                                       \
     template <std::size_t N>                                                                \
     fstubs_name(::boost::python::detail::keywords<N> const& keywords, char const* doc = 0)  \
         : ::boost::python::detail::overloads_common<fstubs_name>(                           \
             doc, keywords.range())                                                          \
     {                                                                                       \
-        typedef typename ::boost::python::detail::                                          \
-            error::more_keywords_than_function_arguments<                                   \
-                N,n_args>::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED;              \
+        BOOST_STATIC_ASSERT(N <= n_args);                                                   \
     }
 
 # if defined(BOOST_NO_VOID_RETURNS)
diff --git a/include/boost/python/init.hpp b/include/boost/python/init.hpp
index 0ee763cc26..26febf48d5 100644
--- a/include/boost/python/init.hpp
+++ b/include/boost/python/init.hpp
@@ -26,6 +26,7 @@
 #include <boost/mpl/prior.hpp>
 #include <boost/mpl/joint_view.hpp>
 #include <boost/mpl/back.hpp>
+#include <boost/static_assert.hpp>
 
 #include <boost/python/detail/type_traits.hpp>
 
@@ -65,10 +66,11 @@ namespace detail
 {
   namespace error
   {
+    /// @deprecated
     template <int keywords, int init_args>
     struct more_keywords_than_init_arguments
     {
-        typedef char too_many_keywords[init_args - keywords >= 0 ? 1 : -1] BOOST_ATTRIBUTE_UNUSED;
+        BOOST_STATIC_ASSERT(keywords <= init_args);
     };
   }
 
@@ -222,18 +224,14 @@ class init : public init_base<init<BOOST_PYTHON_OVERLOAD_ARGS> >
     init(char const* doc_, detail::keywords<N> const& kw)
         : base(doc_, kw.range())
     {
-        typedef typename detail::error::more_keywords_than_init_arguments<
-            N, n_arguments::value + 1
-            >::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED;
+        BOOST_STATIC_ASSERT(N <= n_arguments::value + 1);
     }
 
     template <std::size_t N>
     init(detail::keywords<N> const& kw, char const* doc_ = 0)
         : base(doc_, kw.range())
     {
-        typedef typename detail::error::more_keywords_than_init_arguments<
-            N, n_arguments::value + 1
-            >::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED;
+        BOOST_STATIC_ASSERT(N <= n_arguments::value + 1);
     }
 
     template <class CallPoliciesT>
diff --git a/include/boost/python/make_constructor.hpp b/include/boost/python/make_constructor.hpp
index 3769970cad..eaaf979c40 100644
--- a/include/boost/python/make_constructor.hpp
+++ b/include/boost/python/make_constructor.hpp
@@ -24,6 +24,7 @@
 # include <boost/mpl/push_front.hpp>
 # include <boost/mpl/pop_front.hpp>
 # include <boost/mpl/assert.hpp>
+# include <boost/static_assert.hpp>
 
 namespace boost { namespace python {
 
@@ -182,9 +183,7 @@ namespace detail
   {
       enum { arity = mpl::size<Sig>::value - 1 };
       
-      typedef typename detail::error::more_keywords_than_function_arguments<
-          NumKeywords::value, arity
-          >::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED;
+      BOOST_STATIC_ASSERT(NumKeywords::value <= arity);
     
       typedef typename outer_constructor_signature<Sig>::type outer_signature;
 
diff --git a/include/boost/python/make_function.hpp b/include/boost/python/make_function.hpp
index 7dd7c316b3..a4742a53b5 100644
--- a/include/boost/python/make_function.hpp
+++ b/include/boost/python/make_function.hpp
@@ -15,6 +15,7 @@
 
 # include <boost/mpl/size.hpp>
 # include <boost/mpl/int.hpp>
+# include <boost/static_assert.hpp>
 
 namespace boost { namespace python {
 
@@ -53,9 +54,7 @@ namespace detail
   {
       enum { arity = mpl::size<Sig>::value - 1 };
       
-      typedef typename detail::error::more_keywords_than_function_arguments<
-          NumKeywords::value, arity
-          >::too_many_keywords assertion BOOST_ATTRIBUTE_UNUSED;
+      BOOST_STATIC_ASSERT(NumKeywords::value <= arity);
     
       return objects::function_object(
           detail::caller<F,CallPolicies,Sig>(f, p)
diff --git a/include/boost/python/object/pickle_support.hpp b/include/boost/python/object/pickle_support.hpp
index aa96d655ee..3b905c5745 100644
--- a/include/boost/python/object/pickle_support.hpp
+++ b/include/boost/python/object/pickle_support.hpp
@@ -7,6 +7,8 @@
 
 # include <boost/python/detail/prefix.hpp>
 
+# include <boost/static_assert.hpp>
+
 namespace boost { namespace python {
 
 namespace api
@@ -105,9 +107,7 @@ namespace detail {
       Class_&,
       ...)
     {
-      typedef typename
-        error_messages::missing_pickle_suite_function_or_incorrect_signature<
-          Class_>::error_type error_type BOOST_ATTRIBUTE_UNUSED;
+      BOOST_STATIC_ASSERT(false);
     }
   };