add vendor

vendor/github.com/zclconf/go-cty/cty/set/set.go

@@ -0,0 +1,62 @@
+package set
+
+import (
+	"fmt"
+)
+
+// Set is an implementation of the concept of a set: a collection where all
+// values are conceptually either in or out of the set, but the members are
+// not ordered.
+//
+// This type primarily exists to be the internal type of sets in cty, but
+// it is considered to be at the same level of abstraction as Go's built in
+// slice and map collection types, and so should make no cty-specific
+// assumptions.
+//
+// Set operations are not thread safe. It is the caller's responsibility to
+// provide mutex guarantees where necessary.
+//
+// Set operations are not optimized to minimize memory pressure. Mutating
+// a set will generally create garbage and so should perhaps be avoided in
+// tight loops where memory pressure is a concern.
+type Set struct {
+	vals  map[int][]interface{}
+	rules Rules
+}
+
+// NewSet returns an empty set with the membership rules given.
+func NewSet(rules Rules) Set {
+	return Set{
+		vals:  map[int][]interface{}{},
+		rules: rules,
+	}
+}
+
+func NewSetFromSlice(rules Rules, vals []interface{}) Set {
+	s := NewSet(rules)
+	for _, v := range vals {
+		s.Add(v)
+	}
+	return s
+}
+
+func sameRules(s1 Set, s2 Set) bool {
+	return s1.rules.SameRules(s2.rules)
+}
+
+func mustHaveSameRules(s1 Set, s2 Set) {
+	if !sameRules(s1, s2) {
+		panic(fmt.Errorf("incompatible set rules: %#v, %#v", s1.rules, s2.rules))
+	}
+}
+
+// HasRules returns true if and only if the receiving set has the given rules
+// instance as its rules.
+func (s Set) HasRules(rules Rules) bool {
+	return s.rules.SameRules(rules)
+}
+
+// Rules returns the receiving set's rules instance.
+func (s Set) Rules() Rules {
+	return s.rules
+}