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Fix derived-type macro dispatch capping members at 62 instead of 63
NLOHMANN_JSON_GET_MACRO resolves 64 positional arguments, with NAME at position 65. NLOHMANN_JSON_TYPE_TAG dispatches on Type plus the member list, so it resolves correctly up to the 63 members NLOHMANN_JSON_PASTE supports. NLOHMANN_JSON_DERIVED_TYPE_TAG dispatched on the two-token Type,BaseType prefix plus the member list, running out one slot early: at 63 members, position 65 landed on the last member name instead of a sentinel and NLOHMANN_JSON_CAT built an undefined identifier such as NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_m63, with the compiler reporting "unknown type name 'm1'" once per member and nothing pointing at an argument-count limit. That silently reduced all six NLOHMANN_DEFINE_DERIVED_TYPE_* macros from 63 members to 62, contradicting the "up to 63 members" contract in docs/mkdocs/docs/api/macros/nlohmann_define_derived_type.md. Drop the leading Type and defer to NLOHMANN_JSON_TYPE_TAG so the tag is computed from BaseType plus the member list, which fits the available slots. The zero-own-member derived bodies are therefore selected by tag 1 rather than 2, and the sentinel table for the derived tag is no longer needed. Add a regression test at the documented maximum for both the plain and the derived macros; it fails to compile against the previous dispatch. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
@@ -592,14 +592,20 @@ void templated_json_throw(ExceptionType exception)
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// (issue #4041, e.g. NLOHMANN_DEFINE_TYPE_INTRUSIVE(Type) with no further
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// arguments). NLOHMANN_JSON_TYPE_TAG(...) expands to the token 1 when
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// __VA_ARGS__ is a single token (Type alone) and to N for two or more (Type,
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// member...); NLOHMANN_JSON_DERIVED_TYPE_TAG(...) is the same idea shifted by
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// one slot for the two-token Type,BaseType prefix used by the derived-type
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// macros. Both reuse the existing 64-slot NLOHMANN_JSON_GET_MACRO dispatch
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// member...). It reuses the existing 64-slot NLOHMANN_JSON_GET_MACRO dispatch
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// with one extra trailing sentinel token appended so its own trailing "..."
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// is never left completely empty at the lowest supported argument count --
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// invoking a variadic macro so that "..." matches nothing is only granted
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// unconditionally by the standard since C++20, and pre-C++20 compilers may
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// reject it under -pedantic regardless of what the macro body does.
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//
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// NLOHMANN_JSON_DERIVED_TYPE_TAG(...) answers the same question for the
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// derived-type macros, whose fixed prefix is Type,BaseType. It drops the
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// leading Type and defers to NLOHMANN_JSON_TYPE_TAG rather than shifting the
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// slot table by one: NLOHMANN_JSON_GET_MACRO only resolves 64 positional
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// arguments, so tagging Type,BaseType,member... directly would run out one
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// slot early and cap the derived-type macros at 62 members instead of the 63
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// that NLOHMANN_JSON_PASTE supports.
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#define NLOHMANN_JSON_CAT_(x, y) x ## y
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#define NLOHMANN_JSON_CAT(x, y) NLOHMANN_JSON_CAT_(x, y)
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@@ -613,15 +619,8 @@ void templated_json_throw(ExceptionType exception)
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N, N, N, 1, \
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NLOHMANN_JSON_TYPE_TAG_SENTINEL))
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#define NLOHMANN_JSON_DERIVED_TYPE_TAG(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_GET_MACRO(__VA_ARGS__, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, 2, N, \
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NLOHMANN_JSON_DERIVED_TYPE_TAG_SENTINEL))
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#define NLOHMANN_JSON_DERIVED_TYPE_TAG_(Type, ...) NLOHMANN_JSON_TYPE_TAG(__VA_ARGS__)
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#define NLOHMANN_JSON_DERIVED_TYPE_TAG(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_DERIVED_TYPE_TAG_(__VA_ARGS__))
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/*!
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@brief macro
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@@ -751,7 +750,7 @@ void templated_json_throw(ExceptionType exception)
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) }) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); }) \
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/* NOLINTNEXTLINE(bugprone-macro-parentheses) Type/BaseType are used as declarator types, not in expressions */ \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); })
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@@ -772,7 +771,7 @@ void templated_json_throw(ExceptionType exception)
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType&>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) }) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); const Type nlohmann_json_default_obj{}; NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM_WITH_DEFAULT, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType&>(nlohmann_json_t)); }) \
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/* NOLINTNEXTLINE(bugprone-macro-parentheses) Type/BaseType are used as declarator types, not in expressions */ \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); })
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@@ -792,7 +791,7 @@ void templated_json_throw(ExceptionType exception)
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_N(Type, BaseType, ...) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); })
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#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_CAT(NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_, NLOHMANN_JSON_DERIVED_TYPE_TAG(__VA_ARGS__))(__VA_ARGS__))
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@@ -811,7 +810,7 @@ void templated_json_throw(ExceptionType exception)
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) }) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); }) \
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/* NOLINTNEXTLINE(bugprone-macro-parentheses) Type/BaseType are used as declarator types, not in expressions */ \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); })
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@@ -832,7 +831,7 @@ void templated_json_throw(ExceptionType exception)
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) }) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); const Type nlohmann_json_default_obj{}; NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM_WITH_DEFAULT, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); }) \
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/* NOLINTNEXTLINE(bugprone-macro-parentheses) Type/BaseType are used as declarator types, not in expressions */ \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); })
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@@ -852,7 +851,7 @@ void templated_json_throw(ExceptionType exception)
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_N(Type, BaseType, ...) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); })
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#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_CAT(NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_, NLOHMANN_JSON_DERIVED_TYPE_TAG(__VA_ARGS__))(__VA_ARGS__))
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@@ -2967,14 +2967,20 @@ void templated_json_throw(ExceptionType exception)
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// (issue #4041, e.g. NLOHMANN_DEFINE_TYPE_INTRUSIVE(Type) with no further
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// arguments). NLOHMANN_JSON_TYPE_TAG(...) expands to the token 1 when
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// __VA_ARGS__ is a single token (Type alone) and to N for two or more (Type,
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// member...); NLOHMANN_JSON_DERIVED_TYPE_TAG(...) is the same idea shifted by
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// one slot for the two-token Type,BaseType prefix used by the derived-type
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// macros. Both reuse the existing 64-slot NLOHMANN_JSON_GET_MACRO dispatch
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// member...). It reuses the existing 64-slot NLOHMANN_JSON_GET_MACRO dispatch
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// with one extra trailing sentinel token appended so its own trailing "..."
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// is never left completely empty at the lowest supported argument count --
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// invoking a variadic macro so that "..." matches nothing is only granted
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// unconditionally by the standard since C++20, and pre-C++20 compilers may
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// reject it under -pedantic regardless of what the macro body does.
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//
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// NLOHMANN_JSON_DERIVED_TYPE_TAG(...) answers the same question for the
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// derived-type macros, whose fixed prefix is Type,BaseType. It drops the
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// leading Type and defers to NLOHMANN_JSON_TYPE_TAG rather than shifting the
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// slot table by one: NLOHMANN_JSON_GET_MACRO only resolves 64 positional
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// arguments, so tagging Type,BaseType,member... directly would run out one
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// slot early and cap the derived-type macros at 62 members instead of the 63
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// that NLOHMANN_JSON_PASTE supports.
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#define NLOHMANN_JSON_CAT_(x, y) x ## y
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#define NLOHMANN_JSON_CAT(x, y) NLOHMANN_JSON_CAT_(x, y)
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@@ -2988,15 +2994,8 @@ void templated_json_throw(ExceptionType exception)
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N, N, N, 1, \
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NLOHMANN_JSON_TYPE_TAG_SENTINEL))
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#define NLOHMANN_JSON_DERIVED_TYPE_TAG(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_GET_MACRO(__VA_ARGS__, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, N, N, N, N, N, N, N, N, \
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N, N, 2, N, \
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NLOHMANN_JSON_DERIVED_TYPE_TAG_SENTINEL))
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#define NLOHMANN_JSON_DERIVED_TYPE_TAG_(Type, ...) NLOHMANN_JSON_TYPE_TAG(__VA_ARGS__)
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#define NLOHMANN_JSON_DERIVED_TYPE_TAG(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_DERIVED_TYPE_TAG_(__VA_ARGS__))
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/*!
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@brief macro
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@@ -3126,7 +3125,7 @@ void templated_json_throw(ExceptionType exception)
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) }) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); }) \
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/* NOLINTNEXTLINE(bugprone-macro-parentheses) Type/BaseType are used as declarator types, not in expressions */ \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); })
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@@ -3147,7 +3146,7 @@ void templated_json_throw(ExceptionType exception)
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType&>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) }) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); const Type nlohmann_json_default_obj{}; NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM_WITH_DEFAULT, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType&>(nlohmann_json_t)); }) \
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/* NOLINTNEXTLINE(bugprone-macro-parentheses) Type/BaseType are used as declarator types, not in expressions */ \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); })
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@@ -3167,7 +3166,7 @@ void templated_json_throw(ExceptionType exception)
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_N(Type, BaseType, ...) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) })
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_2(Type, BaseType) \
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#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_1(Type, BaseType) \
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(friend void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); })
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#define NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_CAT(NLOHMANN_JSON_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE_, NLOHMANN_JSON_DERIVED_TYPE_TAG(__VA_ARGS__))(__VA_ARGS__))
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@@ -3186,7 +3185,7 @@ void templated_json_throw(ExceptionType exception)
|
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NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) }) \
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM, __VA_ARGS__)) })
|
||||
|
||||
#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_2(Type, BaseType) \
|
||||
#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_1(Type, BaseType) \
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); }) \
|
||||
/* NOLINTNEXTLINE(bugprone-macro-parentheses) Type/BaseType are used as declarator types, not in expressions */ \
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); })
|
||||
@@ -3207,7 +3206,7 @@ void templated_json_throw(ExceptionType exception)
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) }) \
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); const Type nlohmann_json_default_obj{}; NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM_WITH_DEFAULT, __VA_ARGS__)) })
|
||||
|
||||
#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_2(Type, BaseType) \
|
||||
#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT_1(Type, BaseType) \
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); }) \
|
||||
/* NOLINTNEXTLINE(bugprone-macro-parentheses) Type/BaseType are used as declarator types, not in expressions */ \
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { nlohmann::from_json(nlohmann_json_j, static_cast<BaseType&>(nlohmann_json_t)); })
|
||||
@@ -3227,7 +3226,7 @@ void templated_json_throw(ExceptionType exception)
|
||||
#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_N(Type, BaseType, ...) \
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) })
|
||||
|
||||
#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_2(Type, BaseType) \
|
||||
#define NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_1(Type, BaseType) \
|
||||
NLOHMANN_JSON_BASIC_TYPE_TEMPLATE(void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { nlohmann::to_json(nlohmann_json_j, static_cast<const BaseType &>(nlohmann_json_t)); })
|
||||
|
||||
#define NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_CAT(NLOHMANN_JSON_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE_, NLOHMANN_JSON_DERIVED_TYPE_TAG(__VA_ARGS__))(__VA_ARGS__))
|
||||
|
||||
@@ -896,6 +896,36 @@ class empty_derived_non_intrusive_only_serialize : public person_with_private_da
|
||||
// NOLINTNEXTLINE(misc-use-internal-linkage)
|
||||
NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(empty_derived_non_intrusive_only_serialize, person_with_private_data)
|
||||
|
||||
// Types at the documented maximum member count (63) for issue #4041's
|
||||
// argument-count dispatch. The derived-type macros carry a two-token
|
||||
// Type,BaseType prefix, so they reach two slots further into
|
||||
// NLOHMANN_JSON_GET_MACRO than the non-derived ones and are the first to break
|
||||
// if the tag dispatch runs out of positional slots.
|
||||
class max_members
|
||||
{
|
||||
public:
|
||||
int m1{}, m2{}, m3{}, m4{}, m5{}, m6{}, m7{}, m8{}, m9{}, m10{}, m11{}, m12{}, m13{}, m14{}, m15{}, m16{}, m17{}, m18{}, m19{}, m20{}, m21{}, m22{}, m23{}, m24{}, m25{}, m26{}, m27{}, m28{}, m29{}, m30{}, m31{}, m32{}, m33{}, m34{}, m35{}, m36{}, m37{}, m38{}, m39{}, m40{}, m41{}, m42{}, m43{}, m44{}, m45{}, m46{}, m47{}, m48{}, m49{}, m50{}, m51{}, m52{}, m53{}, m54{}, m55{}, m56{}, m57{}, m58{}, m59{}, m60{}, m61{}, m62{}, m63{};
|
||||
|
||||
NLOHMANN_DEFINE_TYPE_INTRUSIVE(max_members, m1, m2, m3, m4, m5, m6, m7, m8, m9, m10, m11, m12, m13, m14, m15, m16, m17, m18, m19, m20, m21, m22, m23, m24, m25, m26, m27, m28, m29, m30, m31, m32, m33, m34, m35, m36, m37, m38, m39, m40, m41, m42, m43, m44, m45, m46, m47, m48, m49, m50, m51, m52, m53, m54, m55, m56, m57, m58, m59, m60, m61, m62, m63)
|
||||
};
|
||||
|
||||
class max_members_base
|
||||
{
|
||||
public:
|
||||
int base_value = 0;
|
||||
|
||||
NLOHMANN_DEFINE_TYPE_INTRUSIVE(max_members_base, base_value)
|
||||
};
|
||||
|
||||
class max_members_derived : public max_members_base
|
||||
{
|
||||
public:
|
||||
int m1{}, m2{}, m3{}, m4{}, m5{}, m6{}, m7{}, m8{}, m9{}, m10{}, m11{}, m12{}, m13{}, m14{}, m15{}, m16{}, m17{}, m18{}, m19{}, m20{}, m21{}, m22{}, m23{}, m24{}, m25{}, m26{}, m27{}, m28{}, m29{}, m30{}, m31{}, m32{}, m33{}, m34{}, m35{}, m36{}, m37{}, m38{}, m39{}, m40{}, m41{}, m42{}, m43{}, m44{}, m45{}, m46{}, m47{}, m48{}, m49{}, m50{}, m51{}, m52{}, m53{}, m54{}, m55{}, m56{}, m57{}, m58{}, m59{}, m60{}, m61{}, m62{}, m63{};
|
||||
|
||||
NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE(max_members_derived, max_members_base, m1, m2, m3, m4, m5, m6, m7, m8, m9, m10, m11, m12, m13, m14, m15, m16, m17, m18, m19, m20, m21, m22, m23, m24, m25, m26, m27, m28, m29, m30, m31, m32, m33, m34, m35, m36, m37, m38, m39, m40, m41, m42, m43, m44, m45, m46, m47, m48, m49, m50, m51, m52, m53, m54, m55, m56, m57, m58, m59, m60, m61, m62, m63)
|
||||
};
|
||||
|
||||
|
||||
} // namespace persons
|
||||
|
||||
TEST_CASE_TEMPLATE("Serialization/deserialization via NLOHMANN_DEFINE_TYPE_INTRUSIVE and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE", Pair, // NOLINT(readability-math-missing-parentheses, bugprone-throwing-static-initialization)
|
||||
@@ -1414,3 +1444,36 @@ TEST_CASE_TEMPLATE("Serialization/deserialization of zero-member types via NLOHM
|
||||
CHECK(j.dump() == derived_dump);
|
||||
}
|
||||
}
|
||||
|
||||
// Regression test for the argument-count dispatch added for issue #4041: the
|
||||
// documented maximum of 63 members must keep working, including for the
|
||||
// derived-type macros whose Type,BaseType prefix consumes two dispatch slots.
|
||||
TEST_CASE_TEMPLATE("Serialization/deserialization of maximum-member-count types via NLOHMANN_DEFINE_TYPE_*", Json, // NOLINT(readability-math-missing-parentheses, bugprone-throwing-static-initialization)
|
||||
nlohmann::json, nlohmann::ordered_json)
|
||||
{
|
||||
SECTION("NLOHMANN_DEFINE_TYPE_INTRUSIVE with 63 members")
|
||||
{
|
||||
persons::max_members obj{};
|
||||
obj.m1 = 1;
|
||||
obj.m63 = 63;
|
||||
Json j = obj;
|
||||
CHECK(j.size() == 63);
|
||||
const auto obj2 = j.template get<persons::max_members>();
|
||||
CHECK(obj2.m1 == 1);
|
||||
CHECK(obj2.m63 == 63);
|
||||
}
|
||||
|
||||
SECTION("NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE with 63 own members")
|
||||
{
|
||||
persons::max_members_derived obj{};
|
||||
obj.base_value = 7;
|
||||
obj.m1 = 1;
|
||||
obj.m63 = 63;
|
||||
Json j = obj;
|
||||
CHECK(j.size() == 64);
|
||||
const auto obj2 = j.template get<persons::max_members_derived>();
|
||||
CHECK(obj2.base_value == 7);
|
||||
CHECK(obj2.m1 == 1);
|
||||
CHECK(obj2.m63 == 63);
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user