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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package typedsync
import (
"sync"
)
// Map is a type-safe equivalent of the standard library's sync.Map.
//
// With versions of Go prior to Go 1.20, Map is specified too loosely,
// as
//
// Map[K any, V any]
//
// while with Go 1.20 and later, Map is specified as
//
// Map[K comparable, V any]
//
// This is because with Go versions prior to 1.20, 'comparable' was
// overly strict, disallowing many types that are valid map-keys (see
// https://github.com/golang/go/issues/56548). The type used as K in
// a Map older versions of Go must be a valid map-key type, even
// though the type specification of Map does not enforce that.
type Map[K mapkey, V any] struct {
inner sync.Map
}
func (m *Map[K, V]) Delete(key K) {
m.inner.Delete(key)
}
func (m *Map[K, V]) Load(key K) (value V, ok bool) {
_value, ok := m.inner.Load(key)
if ok {
//nolint:forcetypeassert // Typed wrapper around untyped lib.
value = _value.(V)
}
return value, ok
}
func (m *Map[K, V]) LoadAndDelete(key K) (value V, loaded bool) {
_value, ok := m.inner.LoadAndDelete(key)
if ok {
//nolint:forcetypeassert // Typed wrapper around untyped lib.
value = _value.(V)
}
return value, ok
}
func (m *Map[K, V]) LoadOrStore(key K, value V) (actual V, loaded bool) {
_actual, loaded := m.inner.LoadOrStore(key, value)
//nolint:forcetypeassert // Typed wrapper around untyped lib.
actual = _actual.(V)
return actual, loaded
}
func (m *Map[K, V]) Range(f func(key K, value V) bool) {
m.inner.Range(func(key, value any) bool {
//nolint:forcetypeassert // Typed wrapper around untyped lib.
return f(key.(K), value.(V))
})
}
func (m *Map[K, V]) Store(key K, value V) {
m.inner.Store(key, value)
}
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