storage_ptr is a shared pointer

test/string.cpp

@@ -10,17 +10,47 @@
 // Test that header file is self-contained.
 #include <boost/json/string.hpp>
 
+#include <boost/config.hpp>
 #include <boost/beast/_experimental/unit_test/suite.hpp>
 
+#include "test_storage.hpp"
+
 namespace boost {
 namespace json {
 
 class string_test : public beast::unit_test::suite
 {
 public:
+    void
+    testExceptions()
+    {
+        string s1 = "Hello, world!";
+        auto sp =
+            std::make_shared<fail_storage>();
+        string s2;
+        while(sp->fail < 200)
+        {
+            try
+            {
+                auto s = string(
+                    string::allocator_type{sp});
+                //obj.emplace("a", 2);
+                //obj = obj0;
+                //obj1 = obj;
+                break;
+            }
+            catch(std::bad_alloc const&)
+            {
+            }
+        }
+    }
+
     void
     run() override
     {
+    #if !defined(BOOST_MSVC) || _ITERATOR_DEBUG_LEVEL == 0
+        testExceptions();
+    #endif
         pass();
     }
 };