Is there any way to get the string-name of the member of a struct or class ?

[tonnot]

If I have a struct (in example) Config { double n_users; int n_n;};

Is there any way to write some code which gives me the name of the member of a struct ? I'd want to use it to write its name into an ascii file .
In example (pseudocode)
config.n_users=4; save_data(config_n.users.to_string)
function save_data (string key)
???
Thanks

[squidge]

You can use a #define with the stringizing operator:

eg:

#define SAVE_DATA(token) save_data(#token, token)

#define SAVE_DATA(token) save_data(#token, token)

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[Santosh Reddy]

Yes you can do this using Qt Meta Object System, it is not very straight forward you need to refactor you exsiting code, to a good extent to make it work.

http://doc.qt.nokia.com/4.7-snapshot/object.html

[tonnot]

Thanks squidge, but in your proposal I'd have to write two macros one to store and another one to retrieve the data.
An if my struct is (in example) my_cofig.my_value .... can you show me how can I write the both macros ?
(the examples I have seen on the web are simple.)
My struct are going to have more than 100 elements....

Santosh. Thanks also. But How can I specify types (doubles, ints, strings, etc ) ?

[wysota]

If you teach your structure to save itself from within its own scope (i.e. from its method), you will not need to reference the structure name anywhere and you can use the solution squidge offered you (if that's not ok then simply write a macro accepting two arguments -- the structure variable name and the member in the structure). If you don't want to write two lines of code (although I have no idea what two lines of code you mean) then write another macro that will execute the two relevant statements and you'll do it with one line of code.

#define SAVE_DATA(var, token) save_data(#token, var.token)

#define SAVE_DATA(var, token) save_data(#token, var.token)

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