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addHook(HashTable,Thing,Function) -- add a hook function to an object for later processing

Synopsis

Usage:
addHook(obj,key,hook)
Function: addHook
Inputs:
- obj, a hash table
- key, a thing
- hook, a function
Consequences:
- the function hook is added to the beginning of the list (possibly absent) of hooks stored in obj#key or obj.cache#key

Code

-- ../m2/methods.m2:446
addHook   (HashTable,Thing,Function) := (obj,key,hook) -> (c := obj.cache; if c#?key then c#key = prepend(hook,c#key) else c#key = {hook})
-- ../m2/methods.m2:442
addHook   (MutableHashTable,Thing,Function) := (obj,key,hook) -> if obj#?key then obj#key = prepend(hook,obj#key) else obj#key = {hook}

See also

runHooks -- run the hook functions stored in an object
removeHook -- remove a hook function from an object