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:@fetchfrom

@fetchfrom

Equivalent to fetch(@spawnat p expr).

Examples

Sure! Here are code examples and common mistakes for the @fetchfrom macro in Julia:

1. Fetch result from a remote process:

   julia> @fetchfrom 2 2 + 2
   4

   This example fetches the result of the expression 2 + 2 from process 2 and returns the result.

2. Fetch a complex computation from a remote process:

   julia> @fetchfrom 4 begin
              fib(n) = n < 2 ? n : fib(n-1) + fib(n-2)
              fib(10)
          end
   55

   Here, the fib(10) computation is performed on process 4, and the result is fetched back to the main process.

3. Handle exceptions from a remote process:

   julia> @fetchfrom 3 sqrt(-1)
   ERROR: DomainError with -1.0:
   sqrt will only return a complex result if called with a complex argument. Try sqrt(Complex(x)).
   Stacktrace:
   ...

   In this example, the sqrt(-1) expression is evaluated on process 3, and any exceptions are propagated back to the main process.

Common mistake example:

julia> @fetchfrom 5 2 + 2
ERROR: UndefVarError: + not defined
Stacktrace:
...

In this example, the + operator is not defined on process 5. It's important to ensure that the required functions and operators are defined in the remote process before using @fetchfrom to avoid such errors.

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