Creates a callback which can only be called once. This may be useful for security, when passing
a callback to untrusted code: most callbacks do not expect to be called more than once, so
doing so may expose bugs if it is not prevented.
Take an RpcCallback accepting a specific message type and convert it to an
RpcCallback<Message>. The generalized callback will accept any message object which has the
same descriptor, and will convert it to the correct class before calling the original callback.
However, if the generalized callback is given a message with a different descriptor, an
exception will be thrown.
Take an RpcCallback<Message> and convert it to an RpcCallback accepting a
specific message type. This is always type-safe (parameter type contravariance).
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-01-21 UTC."],[],[]]
