Add __declspec(novtable) for memory_resource in MSVC compilers to slightly optimize code generation (just like MS STL does)

igaztanaga · igaztanaga · commit 1a0bbe0e7975 · 2025-12-18T10:02:13.000+01:00
diff --git a/include/boost/container/detail/workaround.hpp b/include/boost/container/detail/workaround.hpp
@@ -246,4 +246,10 @@ namespace boost {
 #  define BOOST_CONTAINER_CONCEPTS_BASED_OVERLOADING
 #endif
 
+#ifdef _MSC_VER
+    #define BOOST_CONTAINER_NOVTABLE __declspec(novtable)
+#else
+    #define BOOST_CONTAINER_NOVTABLE
+#endif
+
 #endif   //#ifndef BOOST_CONTAINER_DETAIL_WORKAROUND_HPP
diff --git a/include/boost/container/pmr/memory_resource.hpp b/include/boost/container/pmr/memory_resource.hpp
@@ -28,7 +28,7 @@ namespace pmr {
 
 //! The memory_resource class is an abstract interface to an
 //! unbounded set of classes encapsulating memory resources.
-class memory_resource
+class BOOST_CONTAINER_NOVTABLE memory_resource
 {
    public:
    // For exposition only

Original file line number	Diff line number	Diff line change
`@@ -28,7 +28,7 @@ namespace pmr {`
`28`	`28`
`29`	`29`	`//! The memory_resource class is an abstract interface to an`
`30`	`30`	`//! unbounded set of classes encapsulating memory resources.`
`31`		`-class memory_resource`
	`31`	`+class BOOST_CONTAINER_NOVTABLE memory_resource`
`32`	`32`	`{`
`33`	`33`	`public:`
`34`	`34`	`// For exposition only`