C macro for protobuf message comparison

Asked Mar 19 '18 at 10:59

Active Mar 19 '18 at 10:59

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My goal is to compare some fields in protobuf messages. I have tried MessageDifferencer, but I don't want to use reflection. I'm using protobuf 3.4.0.

Time variables are stored in protobuf's well-known types like google.protobuf.Duration and google.protobuf.Timestamp.

I would like to use a macro which takes two objects and a field name:

CHECK_GPS_TIME ( expectedGps, storedGps, gps_time );

I'm expecting the following result:

CHECK ( expectedGps.gps_time().seconds() == storedGps.gps_time().seconds() );

I already have a macro for simple types:

#define CHECK_GPS_FIELD(expected, stored, field) CHECK( expected.field() == stored.field() );

asked Mar 19 '18 at 10:59

Jónás Balázs

what is the question/problem? – 463035818_is_not_an_ai Mar 19 '18 at 11:09
I would like to ask some help how to paste more function names (in this case ".seconds()") after the field. – Jónás Balázs Mar 19 '18 at 11:14
My first guess would be: #define CHECK_GPS_TIME (expected, stored, field) CHECK_GPS_FIELD( expected, stored, field##.seconds()) – Jónás Balázs Mar 19 '18 at 11:26
why is `GPS_TIME` part of the macro name when you also pass `gps_time` as parameter? – 463035818_is_not_an_ai Mar 19 '18 at 11:27
I'm using catch.hpp where CHECK macro is already defined. – Jónás Balázs Mar 19 '18 at 11:30
to be honest I dont really understand what would be the benefit if you can write `CHECK_GPS_TIME ( expectedGps, storedGps, gps_time );` instead of `CHECK ( expectedGps.gps_time().seconds() == storedGps.gps_time().seconds() );`. Anyhow, you should include your first guess and the error messages into the question – 463035818_is_not_an_ai Mar 19 '18 at 12:18
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/167091/discussion-between-jonas-balazs-and-user463035818). – Jónás Balázs Mar 19 '18 at 13:22

C macro for protobuf message comparison

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