Mark constexpr global variables as inline.

chriskohlhoff · chriskohlhoff · commit efdc25ab9978 · 2024-08-06T22:46:00.000+10:00
diff --git a/asio/include/asio/as_tuple.hpp b/asio/include/asio/as_tuple.hpp
@@ -141,7 +141,7 @@ struct partial_as_tuple
  * asynchronous operation's default completion token (or asio::deferred
  * if no default is available).
  */
-constexpr partial_as_tuple as_tuple;
+ASIO_INLINE_VARIABLE constexpr partial_as_tuple as_tuple;
 
 } // namespace asio
 
diff --git a/asio/include/asio/deferred.hpp b/asio/include/asio/deferred.hpp
@@ -708,7 +708,7 @@ inline auto operator|(Head head, Tail&& tail)
 /**
  * See the documentation for asio::deferred_t for a usage example.
  */
-constexpr deferred_t deferred;
+ASIO_INLINE_VARIABLE constexpr deferred_t deferred;
 
 } // namespace asio
 
diff --git a/asio/include/asio/detached.hpp b/asio/include/asio/detached.hpp
@@ -94,7 +94,7 @@ class detached_t
 /**
  * See the documentation for asio::detached_t for a usage example.
  */
-constexpr detached_t detached;
+ASIO_INLINE_VARIABLE constexpr detached_t detached;
 
 } // namespace asio
 
diff --git a/asio/include/asio/detail/config.hpp b/asio/include/asio/detail/config.hpp
@@ -366,6 +366,19 @@
 # endif // !defined(ASIO_DISABLE_VARIADIC_LAMBDA_CAPTURES)
 #endif // !defined(ASIO_HAS_VARIADIC_LAMBDA_CAPTURES)
 
+// Support for inline variables.
+#if !defined(ASIO_HAS_INLINE_VARIABLES)
+# if !defined(ASIO_DISABLE_INLINE_VARIABLES)
+#  if (__cplusplus >= 201703) && (__cpp_inline_variables >= 201606)
+#   define ASIO_HAS_INLINE_VARIABLES 1
+#   define ASIO_INLINE_VARIABLE inline
+#  endif // (__cplusplus >= 201703) && (__cpp_inline_variables >= 201606)
+# endif // !defined(ASIO_DISABLE_INLINE_VARIABLES)
+#endif // !defined(ASIO_HAS_INLINE_VARIABLES)
+#if !defined(ASIO_INLINE_VARIABLE)
+# define ASIO_INLINE_VARIABLE
+#endif // !defined(ASIO_INLINE_VARIABLE)
+
 // Default alignment.
 #if defined(__STDCPP_DEFAULT_NEW_ALIGNMENT__)
 # define ASIO_DEFAULT_ALIGN __STDCPP_DEFAULT_NEW_ALIGNMENT__
diff --git a/asio/include/asio/execution/allocator.hpp b/asio/include/asio/execution/allocator.hpp
@@ -225,7 +225,7 @@ const T allocator_t<void>::static_query_v;
 #endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
        //   && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
 
-constexpr allocator_t<void> allocator;
+ASIO_INLINE_VARIABLE constexpr allocator_t<void> allocator;
 
 } // namespace execution
 
diff --git a/asio/include/asio/execution/blocking.hpp b/asio/include/asio/execution/blocking.hpp
@@ -892,7 +892,7 @@ const T never_t<I>::static_query_v;
 
 typedef detail::blocking_t<> blocking_t;
 
-constexpr blocking_t blocking;
+ASIO_INLINE_VARIABLE constexpr blocking_t blocking;
 
 } // namespace execution
 
diff --git a/asio/include/asio/execution/blocking_adaptation.hpp b/asio/include/asio/execution/blocking_adaptation.hpp
@@ -718,7 +718,7 @@ void blocking_execute(
 
 typedef detail::blocking_adaptation_t<> blocking_adaptation_t;
 
-constexpr blocking_adaptation_t blocking_adaptation;
+ASIO_INLINE_VARIABLE constexpr blocking_adaptation_t blocking_adaptation;
 
 } // namespace execution
 
diff --git a/asio/include/asio/execution/context.hpp b/asio/include/asio/execution/context.hpp
@@ -138,7 +138,7 @@ const T context_t<I>::static_query_v;
 
 typedef detail::context_t<> context_t;
 
-constexpr context_t context;
+ASIO_INLINE_VARIABLE constexpr context_t context;
 
 } // namespace execution
 
diff --git a/asio/include/asio/execution/mapping.hpp b/asio/include/asio/execution/mapping.hpp
@@ -733,7 +733,7 @@ const T other_t<I>::static_query_v;
 
 typedef detail::mapping_t<> mapping_t;
 
-constexpr mapping_t mapping;
+ASIO_INLINE_VARIABLE constexpr mapping_t mapping;
 
 } // namespace execution
 
diff --git a/asio/include/asio/execution/occupancy.hpp b/asio/include/asio/execution/occupancy.hpp
@@ -131,7 +131,7 @@ const T occupancy_t<I>::static_query_v;
 
 typedef detail::occupancy_t<> occupancy_t;
 
-constexpr occupancy_t occupancy;
+ASIO_INLINE_VARIABLE constexpr occupancy_t occupancy;
 
 } // namespace execution
 
diff --git a/asio/include/asio/execution/outstanding_work.hpp b/asio/include/asio/execution/outstanding_work.hpp
@@ -544,7 +544,7 @@ const T tracked_t<I>::static_query_v;
 
 typedef detail::outstanding_work_t<> outstanding_work_t;
 
-constexpr outstanding_work_t outstanding_work;
+ASIO_INLINE_VARIABLE constexpr outstanding_work_t outstanding_work;
 
 } // namespace execution
 
diff --git a/asio/include/asio/execution/relationship.hpp b/asio/include/asio/execution/relationship.hpp
@@ -542,7 +542,7 @@ const T continuation_t<I>::static_query_v;
 
 typedef detail::relationship_t<> relationship_t;
 
-constexpr relationship_t relationship;
+ASIO_INLINE_VARIABLE constexpr relationship_t relationship;
 
 } // namespace execution
 
diff --git a/asio/include/asio/experimental/use_coro.hpp b/asio/include/asio/experimental/use_coro.hpp
@@ -173,9 +173,9 @@ struct use_coro_t
  * See the documentation for asio::use_coro_t for a usage example.
  */
 #if defined(GENERATING_DOCUMENTATION)
-constexpr use_coro_t<> use_coro;
+ASIO_INLINE_VARIABLE constexpr use_coro_t<> use_coro;
 #else
-constexpr use_coro_t<> use_coro(0, 0, 0);
+ASIO_INLINE_VARIABLE constexpr use_coro_t<> use_coro(0, 0, 0);
 #endif
 
 } // namespace experimental
diff --git a/asio/include/asio/experimental/use_promise.hpp b/asio/include/asio/experimental/use_promise.hpp
@@ -99,7 +99,7 @@ struct use_promise_t
   Allocator allocator_;
 };
 
-constexpr use_promise_t<> use_promise;
+ASIO_INLINE_VARIABLE constexpr use_promise_t<> use_promise;
 
 } // namespace experimental
 } // namespace asio
diff --git a/asio/include/asio/placeholders.hpp b/asio/include/asio/placeholders.hpp
@@ -58,12 +58,18 @@ unspecified signal_number;
 
 #else
 
-static constexpr auto& error = std::placeholders::_1;
-static constexpr auto& bytes_transferred = std::placeholders::_2;
-static constexpr auto& iterator = std::placeholders::_2;
-static constexpr auto& results = std::placeholders::_2;
-static constexpr auto& endpoint = std::placeholders::_2;
-static constexpr auto& signal_number = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& error
+  = std::placeholders::_1;
+static ASIO_INLINE_VARIABLE constexpr auto& bytes_transferred
+  = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& iterator
+  = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& results
+  = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& endpoint
+  = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& signal_number
+  = std::placeholders::_2;
 
 #endif
 
diff --git a/asio/include/asio/this_coro.hpp b/asio/include/asio/this_coro.hpp
@@ -32,7 +32,7 @@ struct executor_t
 };
 
 /// Awaitable object that returns the executor of the current coroutine.
-constexpr executor_t executor;
+ASIO_INLINE_VARIABLE constexpr executor_t executor;
 
 /// Awaitable type that returns the cancellation state of the current coroutine.
 struct cancellation_state_t
@@ -57,7 +57,7 @@ struct cancellation_state_t
  *     // ...
  * } @endcode
  */
-constexpr cancellation_state_t cancellation_state;
+ASIO_INLINE_VARIABLE constexpr cancellation_state_t cancellation_state;
 
 #if defined(GENERATING_DOCUMENTATION)
 
diff --git a/asio/include/asio/use_awaitable.hpp b/asio/include/asio/use_awaitable.hpp
@@ -145,9 +145,9 @@ struct use_awaitable_t
  * See the documentation for asio::use_awaitable_t for a usage example.
  */
 #if defined(GENERATING_DOCUMENTATION)
-constexpr use_awaitable_t<> use_awaitable;
+ASIO_INLINE_VARIABLE constexpr use_awaitable_t<> use_awaitable;
 #else
-constexpr use_awaitable_t<> use_awaitable(0, 0, 0);
+ASIO_INLINE_VARIABLE constexpr use_awaitable_t<> use_awaitable(0, 0, 0);
 #endif
 
 } // namespace asio
diff --git a/asio/include/asio/use_future.hpp b/asio/include/asio/use_future.hpp
@@ -145,7 +145,7 @@ class use_future_t
 /**
  * See the documentation for asio::use_future_t for a usage example.
  */
-constexpr use_future_t<> use_future;
+ASIO_INLINE_VARIABLE constexpr use_future_t<> use_future;
 
 } // namespace asio
 
diff --git a/asio/include/asio/uses_executor.hpp b/asio/include/asio/uses_executor.hpp
@@ -45,7 +45,7 @@ struct executor_arg_t
  * See asio::executor_arg_t and asio::uses_executor
  * for more information.
  */
-constexpr executor_arg_t executor_arg;
+ASIO_INLINE_VARIABLE constexpr executor_arg_t executor_arg;
 
 /// The uses_executor trait detects whether a type T has an associated executor
 /// that is convertible from type Executor.
diff --git a/asio/src/doc/reference.dox b/asio/src/doc/reference.dox
@@ -317,6 +317,7 @@ PREDEFINED             = GENERATING_DOCUMENTATION \
                          ASIO_CONSTEXPR=constexpr \
                          ASIO_NOEXCEPT=noexcept \
                          ASIO_NODISCARD= \
+                         ASIO_INLINE_VARIABLE= \
                          ASIO_COMPLETION_SIGNATURE=typename \
                          ASIO_COMPLETION_HANDLER_FOR(s)=typename \
                          ASIO_COMPLETION_TOKEN_FOR(s)=typename \
