how to deal with exceptions when writing json?

[scalpel4k]

Hi,

I see that the write operations are all noexcept. Is there a way to abort writing when some conditions fail using the custom serializers?

thx Michi

[stephenberry]

Can you use std::longjmp?

Currently Glaze does not provide a mechanism for this. However, conditional exception logic within the glaze compile time options is probably a good design choice, so I will be considering how to accomplish this in the future.

[scalpel4k]

I fully understand your reasoning. My use case would be to serialize JSON data that must adhere to a protocol spec/schema. So write errors in that sense are more like logic errors not type errors. And I think these can be just as common ...

Maybe another solution would be to add try_write functions, so the noexcept mechanism could be left untouched.

[stephenberry]

Do you use JSON schema? In a lot of cases we can validate the C++ structures in Glaze at compile time and ensure that the messages generated would conform to the protocol spec/schema. This would mean there would be no runtime validation cost. I've been considering adding this to glaze, as we are part of the way there already. Is this something that would be useful for you, or do you need runtime validation for writing?

[scalpel4k]

now that you're asking I would not complain about compile-time validation, however most use cases that come to my mind would require runtime validation

[stephenberry]

Cool, I'll make an issue concerning writing validation. And, as much as possible we can try to synthesize the compile time and runtime validation.

[scalpel4k]

thanks a lot for the discussion