Specifying all struct/class members at once

[gurbaaz27]

Hi! I am currently using NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...) macro for a project to avoid boilerplate of from_json/to_json functions, and as the documentation states,
"In all macros, the first parameter is the name of the class/struct, and all remaining parameters name the members. "

I wanted to state all members with a single variable in the parameter inside macro, because I will be needing all member variables of my struct (around 15-20 count), and writing all those within the macro one by one (i.e. (name, member1, member2, member3,....,member19) and so on) becomes tedious.

Is there an shortcut to do it? Some macro or even some variable within C++, or any other elegant way?

[nlohmann]

No, this is a limitation of C++.

[falbrechtskirchinger]

Maybe in C++26 or C++29. 🤞

[gurbaaz27]

@nlohmann Thanks for the reply. I also had one more query if you (or anyone else) could take it up.

Is it possible for the library to automatically typecast the value from json when constructing a class/struct from json object. e.g.

struct foo { int a; string b; NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(foo, a, b); };, but the file "input.json" is

{ "a": "100", "b": "bar" }

Or is it NECESSARY that json file should contain "a": 100 instead of "a": "100"? If yes, can you suggest any approach, since I would really be using macros NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT instead of constructing to_json/from_json functions from scratch (as I have a rather complex json file).

[gurbaaz27]

Or is there any way to skip that element and move forward when I encounter a type error?

[falbrechtskirchinger]

{ "a": "100", "b": "bar" }

Or is it NECESSARY that json file should contain "a": 100 instead of "a": "100"? If yes, can you suggest any approach, since I would really be using macros NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT instead of constructing to_json/from_json functions from scratch (as I have a rather complex json file).

Not possible using NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT. You could define your own macro if you want to avoid writing to_json/from_json functions.

Or is there any way to skip that element and move forward when I encounter a type error?

No. Same as above,