Any+Equatable.swift

//
//  Any+Equatable.swift
//  Rx
//
//  Created by Krunoslav Zaher on 12/19/15.
//  Copyright © 2015 Krunoslav Zaher. All rights reserved.
//

import Foundation

/**
 A way to use built in XCTest methods with objects that are partially equatable.
 
 If this can be done simpler, PRs are welcome :)
 */
struct AnyEquatable<Target>
    : Equatable
    , CustomDebugStringConvertible
    , CustomStringConvertible {
    typealias Comparer = (Target, Target) -> Bool

    let _target: Target
    let _comparer: Comparer

    init(target: Target, comparer: Comparer) {
        _target = target
        _comparer = comparer
    }
}

func == <T>(lhs: AnyEquatable<T>, rhs: AnyEquatable<T>) -> Bool {
    return lhs._comparer(lhs._target, rhs._target)
}

extension AnyEquatable {
    var description: String {
        return "\(_target)"
    }

    var debugDescription: String {
        return "\(_target)"
    }
}