Dont declare too many symbols in user namespace

[yanminhui]

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• I searched the issues and found no similar issues.

What happened + What you expected to happen

yalantinglibs/thirdparty/iguana/iguana/reflection.hpp

Lines 645 to 648 in f05e5c9

	#define REFLECTION(STRUCT_NAME, ...) \
	MAKE_META_DATA(STRUCT_NAME, GET_ARG_COUNT(__VA_ARGS__), __VA_ARGS__)

yalantinglibs/thirdparty/iguana/iguana/reflection.hpp

Lines 573 to 579 in f05e5c9

	#define MAKE_META_DATA(STRUCT_NAME, N, ...) \
	constexpr inline std::array<frozen::string, N> arr_##STRUCT_NAME = { \
	MARCO_EXPAND(MACRO_CONCAT(CON_STR, N)(__VA_ARGS__))}; \
	MAKE_META_DATA_IMPL(STRUCT_NAME, \
	MAKE_ARG_LIST(N, &STRUCT_NAME::FIELD, __VA_ARGS__))

@qicosmos as above codes show, it may produce many symbols declare in user namespace if many structures need reflection.

Reproduction way

Anything else

possible solution:

#define REFLECTION(T, arg)                                       \
    constexpr auto meta_info(T) {                                \
        struct impl {                                            \
            constexpr const char* props() const { return #arg; } \
        };                                                       \
        return impl{};                                           \
    }

REFLECTION(int, age)
REFLECTION(char, pname)

std::cout << meta_info(int{}).props() << std::endl;
std::cout << meta_info(char{}).props() << std::endl;

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[qicosmos]

Acctually the main code is a a function now,

yalantinglibs/thirdparty/iguana/iguana/reflection.hpp

Line 555 in f05e5c9

#define MAKE_META_DATA_IMPL(STRUCT_NAME, ...) \

[yanminhui]

MAKE_META_DATA_IMPL

arr_##STRUCT_NAME is outside of MAKE_META_DATA_IMPL.

[poor-circle]

Thank you, I will fix it later.