how to check if a map structure key exist

[fastfading]

Assume map a ini to a structure.
sometimes , not all the key in the structure exist.
When the key is not exist , go-ini use default value "" or 0

how can use know the zero value is the ini file assigned or it is just the default value .
how to distinguish these 2 ?

[unknwon]

Currently it is impossible, if you want to know, you need to call methods yourself instead of using map functionality.

[unknwon]

A way of doing this is to keep track of each field in a table (map in Go), and user can check if it exists by check that table.