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/*
* Copyright 2021 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if !os(WASI)
import Foundation
#else
import SwiftOverlayShims
#endif
/// Enum is a protocol that all flatbuffers enums should conform to
/// Since it allows us to get the actual `ByteSize` and `Value` from
/// a swift enum.
public protocol Enum {
/// associatedtype that the type of the enum should conform to
associatedtype T: Scalar & Verifiable
/// Size of the current associatedtype in the enum
static var byteSize: Int { get }
/// The current value the enum hosts
var value: T { get }
}
extension Enum where Self: Verifiable {
/// Verifies that the current value is which the bounds of the buffer, and if
/// the current `Value` is aligned properly
/// - Parameters:
/// - verifier: Verifier that hosts the buffer
/// - position: Current position within the buffer
/// - type: The type of the object to be verified
/// - Throws: Errors coming from `inBuffer` function
public static func verify<T>(
_ verifier: inout Verifier,
at position: Int,
of type: T.Type) throws where T: Verifiable
{
try verifier.inBuffer(position: position, of: type.self)
}
}
/// UnionEnum is a Protocol that allows us to create Union type of enums
/// and their value initializers. Since an `init` was required by
/// the verifier
public protocol UnionEnum: Enum {
init?(value: T) throws
}
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