Improve error message for const fields

nlohmann · Jun 14, 2021 · 2494932 · 2494932
1 parent 71a514a
commit 2494932
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diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
@@ -3236,6 +3236,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
     ValueType & get_to(ValueType& v) const noexcept(noexcept(
                 JSONSerializer<ValueType>::from_json(std::declval<const basic_json_t&>(), v)))
     {
+        static_assert(!std::is_const<ValueType>::value, "Cannot deserialize into constant fields");
         JSONSerializer<ValueType>::from_json(*this, v);
         return v;
     }

diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
@@ -20256,6 +20256,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
     ValueType & get_to(ValueType& v) const noexcept(noexcept(
                 JSONSerializer<ValueType>::from_json(std::declval<const basic_json_t&>(), v)))
     {
+        static_assert(!std::is_const<ValueType>::value, "Cannot deserialize into constant fields");
         JSONSerializer<ValueType>::from_json(*this, v);
         return v;
     }