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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
// Package maps implements generic (type-parameterized) utilities for
// working with simple Go maps.
package maps
import (
"golang.org/x/exp/constraints"
"git.lukeshu.com/btrfs-progs-ng/lib/slices"
)
func Keys[K comparable, V any](m map[K]V) []K {
ret := make([]K, 0, len(m))
for k := range m {
ret = append(ret, k)
}
return ret
}
func SortedKeys[K constraints.Ordered, V any](m map[K]V) []K {
ret := Keys(m)
slices.Sort(ret)
return ret
}
func HasKey[K comparable, V any](m map[K]V, k K) bool {
_, has := m[k]
return has
}
func HaveAnyKeysInCommon[K comparable, V1, V2 any](small map[K]V1, big map[K]V2) bool {
if len(big) < len(small) {
return HaveAnyKeysInCommon(big, small)
}
for v := range small {
if _, ok := big[v]; ok {
return true
}
}
return false
}
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