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39 lines
773 B
Swift
39 lines
773 B
Swift
//
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// This source file is part of the Web3Swift.io open source project
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// Copyright 2018 The Web3Swift Authors
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// Licensed under Apache License v2.0
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//
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// FirstBit.swift
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//
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// Created by Timofey Solonin on 22/05/2018
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//
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import Foundation
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/** First (most significant) bit of a value */
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public final class FirstBit: IntegerScalar {
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private let int: IntegerScalar
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/**
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Ctor
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- parameters:
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- value: value to take the bit from
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*/
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public init(value: IntegerScalar) {
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self.int = value
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}
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/**
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- returns:
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0 if first bit is 0, 1 if first is 1
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*/
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public func value() throws -> Int {
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let value = try int.value()
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return Int(
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UInt(bitPattern: value) >> (value.bitWidth - 1)
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)
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}
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} |