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csharp: Use value type wrapper containers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,17 +1,16 @@ | ||
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| using System; | ||
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| namespace Serde | ||
| { | ||
| public sealed class Unit | ||
| public sealed class Unit : IEquatable<Unit> | ||
| { | ||
| public Unit() { } | ||
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| public override bool Equals(object obj) | ||
| { | ||
| if (obj == null || GetType() != obj.GetType()) | ||
| return false; | ||
| return true; | ||
| } | ||
| public override bool Equals(object obj) => obj is Unit unit; | ||
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| public bool Equals(Unit other) => other != null; | ||
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| public override int GetHashCode() => 7; | ||
| public override int GetHashCode() => 793253941; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
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| namespace Serde | ||
| { | ||
| /// <summary> | ||
| /// Immutable wrapper class around T[]. Implements value semantics for | ||
| /// <see cref="object.Equals(object)"/> and <see cref="object.GetHashCode"/>. | ||
| /// </summary> | ||
| public class ValueArray<T> : IEquatable<ValueArray<T>>, IReadOnlyList<T>, IStructuralEquatable | ||
| where T: IEquatable<T> | ||
| { | ||
| private readonly T[] array; | ||
| private int? hashCode; | ||
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| public int Count => array.Length; | ||
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| public T this[int index] => array[index]; | ||
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| public ValueArray(T[] data) { | ||
| array = data ?? throw new ArgumentNullException(nameof(data)); | ||
| hashCode = null; | ||
| } | ||
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| public T[] ToArray() => array.ToArray(); | ||
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| public static implicit operator ReadOnlySpan<T>(ValueArray<T> bytes) => bytes.array; | ||
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| public ReadOnlySpan<T> AsReadOnlySpan() => array; | ||
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| public override bool Equals(object obj) => obj is ValueArray<T> bytes && Equals(bytes); | ||
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| public bool Equals(ValueArray<T> other) { | ||
| if (other == null) return false; | ||
| if (ReferenceEquals(this, other)) return true; | ||
| if (Count != other.Count) return false; | ||
| for (int i = 0; i < Count; i++) | ||
| if (!array[i].Equals(other[i])) return false; | ||
| return true; | ||
| } | ||
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| public static bool operator ==(ValueArray<T> left, ValueArray<T> right) => Equals(left, right); | ||
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| public static bool operator !=(ValueArray<T> left, ValueArray<T> right) => !Equals(left, right); | ||
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| public IEnumerator<T> GetEnumerator() => ((IEnumerable<T>)array).GetEnumerator(); | ||
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| IEnumerator IEnumerable.GetEnumerator() => array.GetEnumerator(); | ||
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| public override int GetHashCode() | ||
| { | ||
| unchecked | ||
| { | ||
| if (hashCode.HasValue) return hashCode.Value; | ||
| int code = 1849862467; | ||
| foreach (T elem in array) | ||
| code = code * 31 + elem.GetHashCode(); | ||
| hashCode = code; | ||
| return code; | ||
| } | ||
| } | ||
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| public bool Equals(object other, IEqualityComparer comparer) | ||
| { | ||
| return ((IStructuralEquatable)array).Equals(other, comparer); | ||
| } | ||
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| public int GetHashCode(IEqualityComparer comparer) | ||
| { | ||
| return ((IStructuralEquatable)array).GetHashCode(comparer); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
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| namespace Serde | ||
| { | ||
| /// <summary> | ||
| /// Immutable wrapper class around <see cref="Dictionary<K, V>"/>. Implements value semantics for | ||
| /// <see cref="object.Equals(object)"/> and <see cref="object.GetHashCode"/>. | ||
| /// </summary> | ||
| public class ValueDictionary<K, V> : IEquatable<ValueDictionary<K, V>>, IReadOnlyDictionary<K, V> | ||
| where K: IEquatable<K> | ||
| where V: IEquatable<V> | ||
| { | ||
| private readonly Dictionary<K, V> dict; | ||
| private int? hashCode; | ||
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| public int Count => dict.Count; | ||
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| public IEnumerable<K> Keys => dict.Keys; | ||
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| public IEnumerable<V> Values => dict.Values; | ||
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| public V this[K key] => dict[key]; | ||
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| public ValueDictionary(Dictionary<K, V> dictionary) { | ||
| dict = dictionary ?? throw new ArgumentNullException(nameof(dictionary)); | ||
| hashCode = null; | ||
| } | ||
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| public bool ContainsKey(K key) => dict.ContainsKey(key); | ||
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| public bool TryGetValue(K key, out V value) => dict.TryGetValue(key, out value); | ||
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| IEnumerator<KeyValuePair<K, V>> IEnumerable<KeyValuePair<K, V>>.GetEnumerator() => dict.GetEnumerator(); | ||
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| public IEnumerator GetEnumerator() => ((IEnumerable)dict).GetEnumerator(); | ||
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| public override bool Equals(object obj) => obj is ValueDictionary<K, V> bytes && Equals(bytes); | ||
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| public bool Equals(ValueDictionary<K, V> other) { | ||
| if (other == null) return false; | ||
| if (Count != other.Count) return false; | ||
| foreach (var key in Keys) | ||
| { | ||
| if (!other.ContainsKey(key)) return false; | ||
| if (!dict[key].Equals(other[key])) return false; | ||
| } | ||
| return true; | ||
| } | ||
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| public static bool operator ==(ValueDictionary<K, V> left, ValueDictionary<K, V> right) => Equals(left, right); | ||
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| public static bool operator !=(ValueDictionary<K, V> left, ValueDictionary<K, V> right) => !Equals(left, right); | ||
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| public override int GetHashCode() | ||
| { | ||
| unchecked | ||
| { | ||
| if (hashCode.HasValue) return hashCode.Value; | ||
| int code = 45053; | ||
| foreach (var pair in dict) | ||
| { | ||
| code = code * 31 + pair.Key.GetHashCode(); | ||
| code = code * 31 + pair.Value.GetHashCode(); | ||
| } | ||
| hashCode = code; | ||
| return code; | ||
| } | ||
| } | ||
| } | ||
| } |
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