43 lines
1.7 KiB
Swift
43 lines
1.7 KiB
Swift
//
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// Copyright (c) 2018 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// 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 FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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public extension Optional where Wrapped: Sequence, Wrapped.Element: Equatable {
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/// Compares two optional collections with Equtable elements.
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///
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/// - Parameters:
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/// - lhs: First collection.
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/// - rhs: Second collection.
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/// - Returns: True if both parameters are nil or if first collection is equal to second.
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static func == (lhs: [Wrapped.Element]?, rhs: [Wrapped.Element]?) -> Bool {
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switch (lhs, rhs) {
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case let (lhs?, rhs?):
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return lhs == rhs
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case (nil, nil):
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return true
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default:
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return false
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}
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}
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}
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