// Copyright (c) 2016 NoodleNation <noodlebox@noodlenation.net>
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

// MARK: -

/// Optionally assigns `rhs` to `lhs`, iff `rhs != nil`.
/// - parameter lhs: assignment target.
/// - parameter rhs: value to assign to `lhs`.
public func =? <T>(lhs: inout T?, rhs: T?) {
    guard let rhs = rhs else { return }
    lhs = rhs
}

/// Optionally assigns `rhs` to `lhs`, iff `rhs != nil`.
/// - parameter lhs: assignment target.
/// - parameter rhs: value to assign to `lhs`.
public func =? <T>(lhs: inout T!, rhs: T?) {
    guard let rhs = rhs else { return }
    lhs = rhs
}

/// Optionally assigns `rhs` to `lhs`, iff `rhs != nil`.
/// - parameter lhs: assignment target.
/// - parameter rhs: value to assign to `lhs`.
public func =? <T>(lhs: inout T, rhs: T?) {
    guard let rhs = rhs else { return }
    lhs = rhs
}

