Provide global non-throwing operator new/delete in gccpp library

Note: this might require define GC_INCLUDE_NEW by client before
include gc_cpp.h on Windows hosts (to have nothrow_t declared before
the global inline operator new and delete are defined).

* gc_cpp.cc [(!_MSC_VER && !__DMC__ || GC_NO_INLINE_STD_NEW)
&& !GC_INLINE_STD_NEW && GC_OPERATOR_NEW_NOTHROW] (operator new,
operator delete): Define with nothrow_t argument.
* gc_cpp.cc [(!_MSC_VER && !__DMC__ || GC_NO_INLINE_STD_NEW)
&& !GC_INLINE_STD_NEW && GC_OPERATOR_NEW_ARRAY && !CPPCHECK
&& GC_OPERATOR_NEW_NOTHROW] (operator new[], operator delete[]):
Likewise.
* include/gc/gc_cpp.h [GC_INLINE_STD_NEW && GC_OPERATOR_NEW_ARRAY
&& GC_OPERATOR_NEW_NOTHROW] (operator new[], operator delete[]):
Likewise.
* include/gc/gc_cpp.h [GC_INLINE_STD_NEW && GC_OPERATOR_NEW_NOTHROW]
(operator new, operator delete): Likewise.
* include/gc/gc_cpp.h [!GC_OPERATOR_NEW_NOTHROW
&& !GC_NO_OPERATOR_NEW_NOTHROW && (GC_INCLUDE_NEW
&& (__cplusplus>=201103L || _MSVC_LANG>=201103L)
|| __NOTHROW_T_DEFINED)] (GC_OPERATOR_NEW_NOTHROW): Define macro;
add comment.
* include/gc/gc_cpp.h [!GC_INLINE_STD_NEW && GC_NO_INLINE_STD_NEW
&& _MSC_VER && GC_OPERATOR_NEW_ARRAY && GC_OPERATOR_NEW_NOTHROW]
(operator new[], operator delete[]): Add prototype with nothrow_t
argument (with commented out GC_ATTR_MALLOC).
* include/gc/gc_cpp.h [!GC_INLINE_STD_NEW && GC_NO_INLINE_STD_NEW
&& _MSC_VER && GC_OPERATOR_NEW_NOTHROW] (operator new,
operator delete): Likewise.

1 files changed, 24 insertions, 0 deletions

diff --git a/gc_cpp.cc b/gc_cpp.cc
index bcc049f5..d55c4a76 100644
--- a/gc_cpp.cc
+++ b/gc_cpp.cc
@@ -78,6 +78,18 @@ built-in "new" and "delete".
     GC_FREE(obj);
   }
 
+# ifdef GC_OPERATOR_NEW_NOTHROW
+    void* operator new(GC_SIZE_T size, const std::nothrow_t&) GC_NOEXCEPT
+    {
+      return GC_MALLOC_UNCOLLECTABLE(size);
+    }
+
+    void operator delete(void* obj, const std::nothrow_t&) GC_NOEXCEPT
+    {
+      GC_FREE(obj);
+    }
+# endif // GC_OPERATOR_NEW_NOTHROW
+
 # if defined(GC_OPERATOR_NEW_ARRAY) && !defined(CPPCHECK)
     void* operator new[](GC_SIZE_T size) GC_DECL_NEW_THROW
     {
@@ -100,6 +112,18 @@ built-in "new" and "delete".
     {
       GC_FREE(obj);
     }
+
+#   ifdef GC_OPERATOR_NEW_NOTHROW
+      void* operator new[](GC_SIZE_T size, const std::nothrow_t&) GC_NOEXCEPT
+      {
+        return GC_MALLOC_UNCOLLECTABLE(size);
+      }
+
+      void operator delete[](void* obj, const std::nothrow_t&) GC_NOEXCEPT
+      {
+        GC_FREE(obj);
+      }
+#   endif // GC_OPERATOR_NEW_NOTHROW
 # endif // GC_OPERATOR_NEW_ARRAY
 
 # ifdef GC_OPERATOR_SIZED_DELETE