Is it possible to have a "binary" sink?

[jfilleau]

Is it possible to have a "binary sink", similar to p-ranav's binary_log? As is, it looks like spdlog formats the message into a string and only a string. It doesn't look like I can easily intercept the formatting. As I understand it, a custom formatter object can't access the formatting string or logged variables, only the resultant formatted string.

I'd like

logger.log(debug, "temperature: {}; velocity: {}", 10, 20);

To:

1. Store the format string for future extraction.
2. Store the variables in some (potentially compressed) binary format

I don't think it's easy to do this in spdlog, but I want to make sure I'm not missing anything.

[tt4g]

As far as I know, the additional variables passed to the logging function are not accessible.