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- //
- // CryptoSwift
- //
- // Copyright (C) 2014-2017 Marcin Krzyżanowski <marcin@krzyzanowskim.com>
- // This software is provided 'as-is', without any express or implied warranty.
- //
- // In no event will the authors be held liable for any damages arising from the use of this software.
- //
- // Permission is granted to anyone to use this software for any purpose,including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
- //
- // - The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation is required.
- // - Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
- // - This notice may not be removed or altered from any source or binary distribution.
- //
- /*
- Bit shifting with overflow protection using overflow operator "&".
- Approach is consistent with standard overflow operators &+, &-, &*, &/
- and introduce new overflow operators for shifting: &<<, &>>
- Note: Works with unsigned integers values only
- Usage
- var i = 1 // init
- var j = i &<< 2 //shift left
- j &<<= 2 //shift left and assign
- @see: https://medium.com/@krzyzanowskim/swiftly-shift-bits-and-protect-yourself-be33016ce071
- This fuctonality is now implemented as part of Swift 3, SE-0104 https://github.com/apple/swift-evolution/blob/master/proposals/0104-improved-integers.md
- */
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