95 lines
3.0 KiB
Haxe
95 lines
3.0 KiB
Haxe
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/*
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* Copyright (C)2005-2019 Haxe Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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package haxe;
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/**
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A typed interface for bit flags. This is not a real object, only a typed
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interface for an actual Int. Each flag can be tested/set with the
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corresponding enum instance. Up to 32 flags can be stored that way.
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Enum constructor indices are preserved from Haxe syntax, so the first
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declared is index 0, the next index 1 etc. The methods are optimized if the
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enum instance is passed directly, e.g. as `has(EnumCtor)`. Otherwise
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`Type.enumIndex()` reflection is used.
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**/
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abstract EnumFlags<T:EnumValue>(Int) {
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/**
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Initializes the bitflags to `i`.
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**/
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public inline function new(i = 0) {
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this = i;
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}
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/**
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Checks if the index of enum instance `v` is set.
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This method is optimized if `v` is an enum instance expression such as
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`SomeEnum.SomeCtor`.
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If `v` is `null`, the result is unspecified.
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**/
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public inline function has(v:T):Bool {
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return this & (1 << Type.enumIndex(v)) != 0;
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}
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/**
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Sets the index of enum instance `v`.
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This method is optimized if `v` is an enum instance expression such as
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`SomeEnum.SomeCtor`.
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If `v` is `null`, the result is unspecified.
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**/
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public inline function set(v:T):Void {
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this |= 1 << Type.enumIndex(v);
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}
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/**
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Unsets the index of enum instance `v`.
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This method is optimized if `v` is an enum instance expression such as
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`SomeEnum.SomeCtor`.
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If `v` is `null`, the result is unspecified.
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**/
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public inline function unset(v:T):Void {
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this &= 0xFFFFFFFF - (1 << Type.enumIndex(v));
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}
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/**
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Convert a integer bitflag into a typed one (this is a no-op, it does not
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have any impact on speed).
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**/
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public inline static function ofInt<T:EnumValue>(i:Int):EnumFlags<T> {
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return new EnumFlags<T>(i);
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}
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/**
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Convert the typed bitflag into the corresponding int value (this is a
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no-op, it doesn't have any impact on speed).
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**/
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public inline function toInt():Int {
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return this;
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}
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}
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