63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
package set
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import (
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"fmt"
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)
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// Set is an implementation of the concept of a set: a collection where all
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// values are conceptually either in or out of the set, but the members are
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// not ordered.
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//
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// This type primarily exists to be the internal type of sets in cty, but
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// it is considered to be at the same level of abstraction as Go's built in
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// slice and map collection types, and so should make no cty-specific
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// assumptions.
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//
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// Set operations are not thread safe. It is the caller's responsibility to
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// provide mutex guarantees where necessary.
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//
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// Set operations are not optimized to minimize memory pressure. Mutating
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// a set will generally create garbage and so should perhaps be avoided in
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// tight loops where memory pressure is a concern.
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type Set struct {
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vals map[int][]interface{}
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rules Rules
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}
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// NewSet returns an empty set with the membership rules given.
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func NewSet(rules Rules) Set {
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return Set{
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vals: map[int][]interface{}{},
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rules: rules,
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}
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}
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func NewSetFromSlice(rules Rules, vals []interface{}) Set {
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s := NewSet(rules)
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for _, v := range vals {
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s.Add(v)
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}
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return s
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}
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func sameRules(s1 Set, s2 Set) bool {
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return s1.rules == s2.rules
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}
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func mustHaveSameRules(s1 Set, s2 Set) {
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if !sameRules(s1, s2) {
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panic(fmt.Errorf("incompatible set rules: %#v, %#v", s1.rules, s2.rules))
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}
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}
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// HasRules returns true if and only if the receiving set has the given rules
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// instance as its rules.
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func (s Set) HasRules(rules Rules) bool {
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return s.rules == rules
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}
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// Rules returns the receiving set's rules instance.
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func (s Set) Rules() Rules {
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return s.rules
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}
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