[capnproto] Custom kj exception error string

[David Ondrušek]

Hello, i'm integrating libserialport into my project.

Right now i'm trying to write something similar to KJ_WIN32 and KJ_WINSOCK,
to get the libraries' error messages into the exception description.

Seems like all i have to do is poke makeDescriptionImpl into a public
namespace and copy the code that calls it?

[Kenton Varda]

Hi David,

Sorry, I'm hesitant to make this interface public, since it's kind of hairy
and I might have to change it in the future.

Your options are:
1) Take a risk and use it despite being private, and just deal with it if
it breaks someday.
2) Copy/paste the whole implementation out of debug.c++ into your own code.
3) Maybe try to implement your custom error macro in terms of
KJ_FAIL_REQUIRE under the hood?

-Kenton

On Sun, Feb 18, 2018 at 2:28 AM, David Ondrušek <

Post by David Ondrušek
Hello, i'm integrating libserialport into my project.
Right now i'm trying to write something similar to KJ_WIN32 and
KJ_WINSOCK, to get the libraries' error messages into the exception
description.
Seems like all i have to do is poke makeDescriptionImpl into a public
namespace and copy the code that calls it?
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[David Ondrušek]

KJ_FAIL_REQUIRE seems like a good option, i ended up passing in the
expression and reason along the other VA_ARGS, the output is legible enough.

Post by Kenton Varda
Hi David,
Sorry, I'm hesitant to make this interface public, since it's kind of
hairy and I might have to change it in the future.
1) Take a risk and use it despite being private, and just deal with it if
it breaks someday.
2) Copy/paste the whole implementation out of debug.c++ into your own code.
3) Maybe try to implement your custom error macro in terms of
KJ_FAIL_REQUIRE under the hood?
-Kenton