from json support variant

iguana/json_reader.hpp

@@ -499,6 +499,14 @@ IGUANA_INLINE void skip_object_value(It &&it, It &&end) {
   }
 }
 
+template <typename U, typename It, std::enable_if_t<variant_v<U>, int> = 0>
+IGUANA_INLINE void from_json_impl(U &value, It &&it, It &&end) {
+  std::visit(
+      [&](auto &val) {
+        from_json_impl(val, it, end);
+      },
+      value);
+}
 }  // namespace detail
 
 template <typename T, typename It, std::enable_if_t<refletable_v<T>, int>>

test/test.cpp

@@ -1,6 +1,8 @@
 #include <cstddef>
 #include <string>
 #include <vector>
+
+#include "iguana/reflection.hpp"
 #define DOCTEST_CONFIG_IMPLEMENT
 #include <iguana/json_util.hpp>
 #include <iguana/json_writer.hpp>
@@ -161,6 +163,33 @@ void get_value_test_helper(const std::string &json_str, const T &expect) {
   CHECK(actual == expect);
 }
 
+namespace my_space {
+struct inner_struct {
+  int x;
+  int y;
+  int z;
+};
+REFLECTION(inner_struct, x, y, z);
+}  // namespace my_space
+
+struct nest_t {
+  std::string name;
+  my_space::inner_struct value;
+  std::variant<int, std::string> var;
+};
+REFLECTION(nest_t, name, value, var);
+
+TEST_CASE("test variant") {
+  std::variant<int, std::string> var;
+  var = 1;
+  nest_t v{"Hi", {1, 2, 3}, var}, v2;
+  std::string s;
+  iguana::to_json(v, s);
+  std::cout << s << std::endl;
+  iguana::from_json(v2, s);
+  CHECK(v.name == v2.name);
+}
+
 TEST_CASE("test from issues") {
   test test1{};
   std::string str1 =