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John Rommel Estropia
2017-10-01 01:01:10 +09:00
parent 85ed815ec2
commit 1d2eef7894
1 changed files with 39 additions and 0 deletions
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39
Sources/WhereClauseType.swift
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@@ -21,3 +21,42 @@ public protocol WhereClauseType: AnyWhereClause {
*/
associatedtype ObjectType: DynamicObject
}
public extension WhereClauseType {
/**
Combines two `Where` predicates together using `AND` operator.
- Warning: This operator overload is a workaround for Swift generics' inability to constrain by inheritance (https://bugs.swift.org/browse/SR-5213). In effect, this is less type-safe than other overloads because it allows AND'ing clauses of unrelated `DynamicObject` types.
*/
public static func && <TWhere: WhereClauseType>(left: Self, right: TWhere) -> Self {
return Self.init(NSCompoundPredicate(type: .and, subpredicates: [left.predicate, right.predicate]))
}
/**
Combines two `Where` predicates together using `AND` operator.
- Warning: This operator overload is a workaround for Swift generics' inability to constrain by inheritance (https://bugs.swift.org/browse/SR-5213). In effect, this is less type-safe than other overloads because it allows AND'ing clauses of unrelated `DynamicObject` types.
*/
public static func && <TWhere: WhereClauseType>(left: TWhere, right: Self) -> Self {
return Self.init(NSCompoundPredicate(type: .and, subpredicates: [left.predicate, right.predicate]))
}
/**
Combines two `Where` predicates together using `OR` operator.
- Warning: This operator overload is a workaround for Swift generics' inability to constrain by inheritance (https://bugs.swift.org/browse/SR-5213). In effect, this is less type-safe than other overloads because it allows OR'ing clauses of unrelated `DynamicObject` types.
*/
public static func || <TWhere: WhereClauseType>(left: Self, right: TWhere) -> Self {
return Self.init(NSCompoundPredicate(type: .or, subpredicates: [left.predicate, right.predicate]))
}
/**
Combines two `Where` predicates together using `OR` operator.
- Warning: This operator overload is a workaround for Swift generics' inability to constrain by inheritance (https://bugs.swift.org/browse/SR-5213). In effect, this is less type-safe than other overloads because it allows OR'ing clauses of unrelated `DynamicObject` types.
*/
public static func || <TWhere: WhereClauseType>(left: TWhere, right: Self) -> Self {
return Self.init(NSCompoundPredicate(type: .or, subpredicates: [left.predicate, right.predicate]))
}
}