mirror of
https://github.com/Ellpeck/DynamicEnums.git
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82 lines
4.5 KiB
C#
82 lines
4.5 KiB
C#
using System;
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using System.Collections.Generic;
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namespace DynamicEnums {
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/// <summary>
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/// A helper class that allows easier usage of regular <see cref="Enum"/> values, as well as <see cref="FlagsAttribute"/> <see cref="Enum"/> values.
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/// </summary>
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public static class EnumHelper {
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/// <summary>
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/// Returns an array containing all of the values of the given enum type.
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/// Note that this method is a version-independent equivalent of .NET 5's <c>Enum.GetValues<TEnum></c>.
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/// </summary>
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/// <typeparam name="T">The type whose enum to get</typeparam>
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/// <returns>An enumerable of the values of the enum, in declaration order.</returns>
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public static T[] GetValues<T>() where T : struct, Enum {
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#if NET6_0_OR_GREATER
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return Enum.GetValues<T>();
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#else
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return (T[]) Enum.GetValues(typeof(T));
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#endif
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}
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/// <summary>
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/// Returns true if the given <paramref name="value"/> has all of the given <see cref="Enum"/> flags on it.
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/// This operation is equivalent to <see cref="Enum.HasFlag"/>, but doesn't do any additional checks, making it faster.
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/// </summary>
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/// <seealso cref="HasAnyFlags{T}"/>
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/// <param name="value">The value to query flags on.</param>
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/// <param name="flags">The flags to query.</param>
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/// <returns>True if all of the flags are present, false otherwise.</returns>
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public static bool HasAllFlags<T>(this T value, T flags) where T : struct, Enum {
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return (Convert.ToInt64(value) & Convert.ToInt64(flags)) == Convert.ToInt64(flags);
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}
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/// <summary>
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/// Returns true if the given <paramref name="value"/> has any of the given <see cref="Enum"/> flags on it.
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/// </summary>
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/// <seealso cref="HasAllFlags{T}"/>
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/// <param name="value">The value to query flags on.</param>
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/// <param name="flags">The flags to query.</param>
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/// <returns>True if any of the flags are present, false otherwise.</returns>
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public static bool HasAnyFlags<T>(this T value, T flags) where T : struct, Enum {
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return (Convert.ToInt64(value) & Convert.ToInt64(flags)) != 0;
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}
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/// <summary>
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/// Returns all of the defined values from the given enum type <typeparamref name="T"/> which are contained in <paramref name="combinedFlag"/>.
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/// Note that, if combined flags are defined in <typeparamref name="T"/>, and <paramref name="combinedFlag"/> contains them, they will also be returned.
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/// </summary>
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/// <param name="combinedFlag">The combined flags whose individual flags to return.</param>
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/// <param name="includeZero">Whether the enum value 0 should also be returned, if <typeparamref name="T"/> contains one.</param>
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/// <typeparam name="T">The type of enum.</typeparam>
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/// <returns>All of the flags that make up <paramref name="combinedFlag"/>.</returns>
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public static IEnumerable<T> GetFlags<T>(T combinedFlag, bool includeZero = true) where T : struct, Enum {
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foreach (var flag in EnumHelper.GetValues<T>()) {
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if (combinedFlag.HasAllFlags(flag) && (includeZero || Convert.ToInt64(flag) != 0))
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yield return flag;
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}
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}
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/// <summary>
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/// Returns all of the defined unique flags from the given enum type <typeparamref name="T"/> which are contained in <paramref name="combinedFlag"/>.
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/// Any combined flags (flags that aren't powers of two) which are defined in <typeparamref name="T"/> will not be returned.
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/// </summary>
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/// <param name="combinedFlag">The combined flags whose individual flags to return.</param>
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/// <typeparam name="T">The type of enum.</typeparam>
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/// <returns>All of the unique flags that make up <paramref name="combinedFlag"/>.</returns>
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public static IEnumerable<T> GetUniqueFlags<T>(T combinedFlag) where T : struct, Enum {
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var uniqueFlag = 1L;
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foreach (var flag in EnumHelper.GetValues<T>()) {
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var flagValue = Convert.ToInt64(flag);
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// GetValues is always ordered by binary value, so we can be sure that the next flag is bigger than the last
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while (uniqueFlag < flagValue)
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uniqueFlag <<= 1;
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if (flagValue == uniqueFlag && combinedFlag.HasAllFlags(flag))
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yield return flag;
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}
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}
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}
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} |