use boost::variant2::variant instead of std

Author: tyler92

.github/workflows/run_fuzzer.yml

@@ -60,7 +60,7 @@ jobs:
         buildtype: 'boost'
         path: 'head'
         toolset: clang-18
-        cxxstd: 14
+        cxxstd: 17
         targets: libs/json/fuzzing//run
     - name: Pack the corpus
       working-directory: boost-root/libs/json/fuzzing/

fuzzing/fuzz_direct_parse.cpp

@@ -7,16 +7,10 @@
 //
 
 #include <boost/json/parse_into.hpp>
+#include <boost/variant2/variant.hpp>
 #include <boost/describe.hpp>
 #include <map>
 
-#ifndef BOOST_NO_CXX17_HDR_VARIANT
-# include <variant>
-# define IF_CXX17_HDR_VARIANT(...) __VA_ARGS__
-#else
-# define IF_CXX17_HDR_VARIANT(...)
-#endif // BOOST_NO_CXX17_HDR_VARIANT
-
 #ifndef BOOST_NO_CXX17_HDR_OPTIONAL
 # include <optional>
 # define IF_CXX17_HDR_OPTIONAL(...) __VA_ARGS__
@@ -46,10 +40,7 @@ struct Object
     std::tuple<bool, std::uint64_t, std::int64_t, double, std::string> t1;
     std::tuple<std::array<std::string, 3>, std::array<double, 3>, std::nullptr_t> t2;
     std::tuple<std::vector<std::string>, std::vector<double>> t3;
-
-#ifndef BOOST_NO_CXX17_HDR_VARIANT
-    std::variant<bool, std::uint64_t, std::int64_t, double, std::string> v;
-#endif // BOOST_NO_CXX17_HDR_VARIANT
+    boost::variant2::variant<bool, std::uint64_t, std::int64_t, double, std::string> v;
 
 #ifndef BOOST_NO_CXX17_HDR_OPTIONAL
     std::optional<bool> ob;
@@ -61,8 +52,9 @@ struct Object
 };
 
 BOOST_DESCRIBE_STRUCT(Object, (),
-    (b, i64, u64, f, d, s, v1, v2, v3, a1, a2, a3, m1, m2, m3, t1, t2, t3,
-    IF_CXX17_HDR_OPTIONAL(ob, oi, ou, od, os), IF_CXX17_HDR_OPTIONAL(v)))
+    (b, i64, u64, f, d, s, v1, v2, v3, a1, a2, a3, m1, m2, m3, t1, t2, t3, v,
+    IF_CXX17_HDR_OPTIONAL(ob, oi, ou, od, os)))
+
 
 bool
 fuzz_direct_parse(string_view sv)

fuzzing/old_crashes/direct_parse/valid_cxx14.json

@@ -16,5 +16,6 @@
   "m3": {"k": 0.42},
   "t1": [true, 1, 2, 1.23, "s"],
   "t2": [["a", "b", "c"], [1.0, 0.1, 2.2], null],
-  "t3": [[], []]
+  "t3": [[], []],
+  "v": "text"
 }