Structure with more than 37 members cannot be compiled about magic-cpp HOT 5 CLOSED

Apologies for not keeping the documentation up to date

The supported number of struct members is limited, with the default limit set at 32. If you wish to support a greater number, simply run generate.py and pass the -f <count> flag, where count is the maximum number you want to support. For example:

python generate.py -f 64

This will enable support for structs with up to 64 members. The resulting code can be found in the files include/magic/struct_bind_of_field_types.ge and include/magic/struct_bind_of_field_names.ge. You can check these files to ensure that the changes have taken effect.

from magic-cpp.

struct Test
{
int a;
int a1;
int a2;
int a3;
int a4;
int a5;
int a6;
int a7;
int a8;
int a9;
int a10;
int a11;
int a12;
int a13;
int a14;
int a15;
int a16;
int a17;
int a18;
int a19;
int a20;
int a21;
int a22;
int a23;
int a24;
int a25;
int a26;
int a27;
int a28;
int a29;
int a30;
int a31;
int a32;
int a33;
int a34;
int a35;
int a36;
int a37;
int a38;
int a39;
int a40;
int a41;
int a42;
int a43;
int a44;
int a45;
int a46;
int a47;
int a48;
int a49;
int a50;
int a51;
int a52;
int a53;
int a54;
int a55;
int a56;
int a57;
int a58;
int a59;
int a60;
int a61;
int a62;
int a63;
int a64;
int a65;
int a66;
int a67;
int a68;
int a69;
int a70;
int a71;
int a72;
int a73;
int a74;
int a75;
int a76;
int a77;
int a78;
int a79;
int a80;
int a81;
int a82;
int a83;
int a84;
int a85;
int a86;
int a87;
int a88;
int a89;
int a90;
int a91;
int a92;
int a93;
int a94;
int a95;
int a96;
int a97;
int a98;
int a99;
int a100;
int a101;
int a102;
int a103;
int a104;
int a105;
int a106;
int a107;
int a108;
int a109;
int a110;
int a111;
int a112;
int a113;
int a114;
int a115;
int a116;
int a117;
int a118;
int a119;
int a120;
int a121;
int a122;
int a123;
int a124;
int a125;
int a126;
int a127;
};
I tried to do this. When the number of members reaches 122, the compiler will prompt "block nesting is too deep"

from magic-cpp.

Maybe supporting an specialization for your struct will be fine

namespace magic
{
    template<>
    struct type_info<Test>
    {
        constexpr static auto count = 128;
    };
}

the error occurs because of this C1061

Besides, you can also just use GCC or Clang.

from magic-cpp.

C1061 still exists. Maybe you can try it. I use MSVC compiler

namespace magic
{
	template<>
	struct type_info<Test>
	{
		constexpr static auto count = sizeof(Test) / sizeof(int);
	};
}

int main() 
{
	auto f = [](auto field)
	{
		constexpr auto name = field.name();
		std::cout << name << std::endl;
	};

	magic::foreach(Test{}, f);
	getchar();
	return 0;
}

from magic-cpp.

In fact, it can work in my environment: MSVC 19.38. But what is interesting is that if I don't provide a specialization for it, the error C1060: the compiler does not have enough heap will be emitted. If not, it will just compile, although slowly. But without a doubt, too many templates are too hard to handle for MSVC; you would be better off splitting your struct into smaller parts.

from magic-cpp.