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9992a4ae66
Makes InvokeMethod's reply a high-level response object, rather than binary data, matching the abstraction level of the class (and the other languages' implementations). In support of that: - Adds the logic to the codecs to decode response envelopes, which had never been implemented. - Adds a convience implementation of MethodResult that forwards to lambdas, so that one-off invocation handlers are easier to write. Also simplified BinaryMessenger's API so that subclasses only need to implement one version of Send, rather than two almost-identical versions. Fixes https://github.com/flutter/flutter/issues/53223
This code is intended to be built into plugins and applications to provide higher-level, C++ abstractions for interacting with the Flutter library. Over time, the goal is to move more of this code into the library in a way that provides a usable ABI (e.g., does not use standard library in the interfaces). Note that this wrapper is still in early stages. Expect significant churn in both the APIs and the structure of the wrapper (e.g., the exact set of files that need to be built).