From: Matt Corallo <git@bluematt.me>
Date: Sun, 30 May 2021 16:17:25 +0000 (+0000)
Subject: Add an export tag to indicate users cannot implement a given trait
X-Git-Tag: v0.0.98~5^2~6
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=abc2e0d8b1b385b820387da354bfe3694d433bb2;hp=abc2e0d8b1b385b820387da354bfe3694d433bb2;p=ldk-c-bindings

Add an export tag to indicate users cannot implement a given trait

Specifically, for the LDK `EventsProvider` trait, we can't
(trivially) implement the `process_pending_events` function,
defined as:
`fn process_pending_events<H: Deref>(&self, handler: H) where H::Target: EventHandler;`

We currently do not support implementing generic methods, as we'd
need to wrap them in a generic Rust-trait-to-C-trait conversion
utility, which we do not currently have. Thus, because users
almost certainly have no reason to implement the `EventsProvider`
themselves, its simpler to simply prevent the use of the C trait
struct as the Rust trait.

Concretely, this means just skipping the
`impl rustEventsProvider for CEventsProvider` block, which works
fine as no Rust functions take an `EventsProvider` as an argument.
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