✨ Add call_by_need#277
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Problem: - Function call is asymmetric: it allows many arguments, but only one return value. - Higher-order asynchronous functions like `async::then` deal with calling multiple functions and forwarding multiple results; they don't have any building-blocks to work with. Solution: - Add `call_by_need` which, given a tuple of functions and a tuple of arguments, calls the functions as is possible, returning their results and passing on any unused arguments.
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Problem:
async::thendeal with calling multiple functions and forwarding multiple results; they don't have any building-blocks to work with.Solution:
call_by_needwhich, given a tuple of functions and a tuple of arguments, calls the functions as is possible, returning their results and passing on any unused arguments.