Is it possible to programmatically create objects of structs and fill the fields, when you have a list of struct names and field values

Question

Is it possible to programmatically create objects of structs and fill the fields, when you have a list of struct names and field values? Say I have to read entry from (JSON)file and fill up my structs. I have value struct names and values but i want to code such that code will loop all structs and fill the in-memory data. may sound wierd, but is there a way?

You can't do it with a struct but you can create such a data structure using user defined types. There are a bunch of json libraries that do this for you. — Galik
– Galik, Commented Apr 27, 2016 at 11:29

Lightness Races in Orbit · Accepted Answer · 2016-04-27 11:29:58Z

1

Nope. The language feature you're looking for is called reflection, and C++ does not have it.

You could build up a std::map<std::string, SomeType> instead? If SomeType differs depending on the field, a boost::variant will allow you to store any of a number of types at any given time (it's basically a tagged union).

Or you could switch to Python. :)

answered Apr 27, 2016 at 11:29

Lightness Races in Orbit

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2 Comments

sach Over a year ago

is it not possible with Variadic templates? Our library usage is very limited and we are using C++11 compiler

Lightness Races in Orbit Over a year ago

No. Variadic templates are a compile-time construct that allow you to create class/function templates with variable numbers of template arguments.

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