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Macaulay2 > The Macaulay2 language > hash tables > MutableHashTable

MutableHashTable -- the class of all mutable hash tables

Description

A mutable hash table is a type of hash table whose entries can be changed.

Normally the entries in a mutable hash table are not printed, to prevent infinite loops in the printing routines. To print them out, use peek.

i1 : x = new MutableHashTable

o1 = MutableHashTable{}

o1 : MutableHashTable

i2 : scan(0 .. 30, i -> x#i = i^2)

i3 : x # 20

o3 = 400

i4 : x #? 40

o4 = false

See also

HashTable -- the class of all hash tables

Types of mutable hash table :

CacheTable -- hash tables for caching
ChainComplexMap -- the class of all maps between chain complexes
GradedModule -- the class of all graded modules
GradedModuleMap -- the class of all maps between graded modules
GroebnerBasis -- the class of all Groebner bases
Package -- the class of all packages
Resolution -- the class of all resolution computations
ScriptedFunctor -- the class of all scripted functors
Type -- the class of all types
Variety -- the class of all algebraic varieties

Fixed objects of class MutableHashTable :

fileDictionaries -- local dictionaries for loaded files
globalAssignmentHooks -- assignment hooks for global symbols
loadedFiles
nullaryMethods
PrintNames -- table of printed forms of objects
ReverseDictionary -- table of symbols where various types of objects are stored
typicalValues -- types of values returned by functions

For the programmer

The object MutableHashTable is a type, with ancestor classes HashTable < Thing.