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task_local_storage(body, symbol, value)

task_local_storage(body, symbol, value)

Call the function body with a modified task-local storage, in which value is assigned to symbol; the previous value of symbol, or lack thereof, is restored afterwards. Useful for emulating dynamic scoping.

Examples

# Assign a value to a symbol in the current task's task-local storage.
function task_local_storage(symbol, value)
    Base.task_local_storage()[symbol] = value
end

Examples:

1. Assign a value to a symbol:

   julia> task_local_storage(:name, "John")
   "John"

   This example assigns the value "John" to the symbol :name in the current task's task-local storage.

2. Update the value of a symbol:

   julia> task_local_storage(:age, 25)
   25
   
   julia> task_local_storage(:age, 30)
   30

   It assigns the value 25 to the symbol :age and then updates it to 30 in the task-local storage.

3. Access the value of a symbol:

   julia> task_local_storage(:name, "Alice")
   "Alice"
   
   julia> task_local_storage(:name)
   "Alice"

   This example assigns the value "Alice" to the symbol :name and then retrieves its value from the task-local storage.

Common mistake example:

julia> task_local_storage("name", "Bob")
ERROR: MethodError: no method matching task_local_storage(::String, ::String)

In this example, a string "name" is used as the symbol for task-local storage. However, the symbol argument should be a symbol type (Symbol) and not a string. Make sure to use the correct data type for the symbol argument.

See Also

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