Squelch class dllexport warning

include/boost/json/detail/default_resource.hpp

@@ -16,6 +16,12 @@
 BOOST_JSON_NS_BEGIN
 namespace detail {
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4251) // class needs to have dll-interface to be used by clients of class
+#pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class 
+#endif
+
 // A simple memory resource that uses operator new and delete.
 class
     BOOST_SYMBOL_VISIBLE
@@ -65,6 +71,9 @@ public:
         memory_resource const& mr) const noexcept override;
 };
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
 
 union default_resource::
     holder

include/boost/json/detail/shared_resource.hpp

@@ -17,6 +17,11 @@
 BOOST_JSON_NS_BEGIN
 namespace detail {
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class 
+#endif
+
 struct BOOST_SYMBOL_VISIBLE
     shared_resource
     : memory_resource
@@ -70,6 +75,10 @@ public:
     }
 };
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
 } // detail
 BOOST_JSON_NS_END
 

include/boost/json/monotonic_resource.hpp

@@ -19,6 +19,12 @@
 
 BOOST_JSON_NS_BEGIN
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4251) // class needs to have dll-interface to be used by clients of class
+#pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class 
+#endif
+
 //----------------------------------------------------------
 
 /** A dynamically allocating resource with a trivial deallocate
@@ -328,6 +334,10 @@ protected:
 #endif
 };
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
 template<>
 struct is_deallocate_trivial<
     monotonic_resource>

include/boost/json/static_resource.hpp

@@ -16,6 +16,11 @@
 
 BOOST_JSON_NS_BEGIN
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class 
+#endif
+
 //----------------------------------------------------------
 
 /** A resource using a caller-owned buffer, with a trivial deallocate
@@ -222,6 +227,10 @@ protected:
 #endif
 };
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
 template<>
 struct is_deallocate_trivial<
     static_resource>