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Swift 3.0 是 Swift 宣布开源后的首页主要发行版本，包含众多关于核心语言以及标准库的主要改进和优化，同时包含 Swift 在 Linux 上移植的版本，以及官方首个 Swift Package Manager 版本。
Swift 3.0 是一个主要语言发行版本，在源码上与 Swift 2.2 和 2.3 并不兼容，包含了如下的语言特性的变化：
- SE-0002: Removing currying
funcdeclaration syntax - SE-0003: Removing
varfrom Function Parameters - SE-0004: Remove the
++and--operators - SE-0005: Better Translation of Objective-C APIs Into Swift
- SE-0006: Apply API Guidelines to the Standard Library
- SE-0007: Remove C-style for-loops with conditions and incrementers
- SE-0008: Add a Lazy flatMap for Sequences of Optionals
- SE-0016: Adding initializers to Int and UInt to convert from UnsafePointer and UnsafeMutablePointer
- SE-0017: Change
Unmanagedto useUnsafePointer - SE-0019: Swift Testing
- SE-0023: API Design Guidelines
- SE-0025: Scoped Access Level
- SE-0029: Remove implicit tuple splat behavior from function applications
- SE-0031: Adjusting inout Declarations for Type Decoration
- SE-0032: Add
first(where:)method toSequenceType - SE-0033: Import Objective-C Constants as Swift Types
- SE-0034: Disambiguating Line Control Statements from Debugging Identifiers
- SE-0035: Limiting
inoutcapture to@noescapecontexts - SE-0036: Requiring Leading Dot Prefixes for Enum Instance Member Implementations
- SE-0037: Clarify interaction between comments & operators
- SE-0038: Package Manager C Language Target Support
- SE-0039: Modernizing Playground Literals
- SE-0040: Replacing Equal Signs with Colons For Attribute Arguments
- SE-0043: Declare variables in ‘case’ labels with multiple patterns
- SE-0044: Import as Member
- SE-0046: Establish consistent label behavior across all parameters including first labels
- SE-0047: Defaulting non-Void functions so they warn on unused results
- SE-0048: Generic Type Aliases
- SE-0049: Move @noescape and @autoclosure to be type attributes
- SE-0052: Change IteratorType post-nil guarantee
- SE-0053: Remove explicit use of
letfrom Function Parameters - SE-0054: Abolish
ImplicitlyUnwrappedOptionaltype - SE-0055: Make unsafe pointer nullability explicit using Optional
- SE-0057: Importing Objective-C Lightweight Generics
- SE-0059: Update API Naming Guidelines and Rewrite Set APIs Accordingly
- SE-0060: Enforcing order of defaulted parameters
- SE-0061: Add Generic Result and Error Handling to autoreleasepool()
- SE-0062: Referencing Objective-C key-paths
- SE-0063: SwiftPM System Module Search Paths
- SE-0064: Referencing the Objective-C selector of property getters and setters
- SE-0065: A New Model For Collections and Indices
- SE-0066: Standardize function type argument syntax to require parentheses
- SE-0067: Enhanced Floating Point Protocols
- SE-0069: Mutability and Foundation Value Types
- SE-0070: Make Optional Requirements Objective-C-only
- SE-0071: Allow (most) keywords in member references
- SE-0072: Fully eliminate implicit bridging conversions from Swift
- SE-0076: Add overrides taking an UnsafePointer source to non-destructive copying methods on UnsafeMutablePointer
- SE-0077: Improved operator declarations
- SE-0081: Move
whereclause to end of declaration - SE-0085: Package Manager Command Names
- SE-0086: Drop NS Prefix in Swift Foundation
- SE-0088: Modernize libdispatch for Swift 3 naming conventions
- SE-0089: Renaming
String.init<T>(_: T) - SE-0091: Improving operator requirements in protocols
- SE-0092: Typealiases in protocols and protocol extensions
- SE-0093: Adding a public
baseproperty to slices - SE-0094: Add sequence(first:next:) and sequence(state:next:) to the stdlib
- SE-0095: Replace
protocol<P1,P2>syntax withP1 & P2syntax - SE-0096: Converting dynamicType from a property to an operator
- SE-0099: Restructuring Condition Clauses
- SE-0101: Reconfiguring
sizeofand related functions into a unifiedMemoryLayoutstruct - SE-0102: Remove
@noreturnattribute and introduce an emptyNevertype - SE-0103: Make non-escaping closures the default
- SE-0106: Add a
macOSAlias for theOSXPlatform Configuration Test - SE-0107: UnsafeRawPointer API
- SE-0109: Remove the
Booleanprotocol - SE-0111: Remove type system significance of function argument labels
- SE-0112: Improved NSError Bridging
- SE-0113: Add integral rounding functions to FloatingPoint
- SE-0114: Updating Buffer “Value” Names to “Header” Names
- SE-0115: Rename Literal Syntax Protocols
- SE-0116: Import Objective-C
idas SwiftAnytype - SE-0117: Allow distinguishing between public access and public overridability
- SE-0118: Closure Parameter Names and Labels
- SE-0120: Revise
partitionMethod Signature - SE-0121: Remove
OptionalComparison Operators - SE-0124:
Int.init(ObjectIdentifier)andUInt.init(ObjectIdentifier)should have abitPattern:label - SE-0125: Remove
NonObjectiveCBaseandisUniquelyReferenced - SE-0127: Cleaning up stdlib Pointer and Buffer Routines
- SE-0128: Change failable UnicodeScalar initializers to failable
- SE-0129: Package Manager Test Naming Conventions
- SE-0130: Replace repeating
CharacterandUnicodeScalarforms of String.init - SE-0131: Add
AnyHashableto the standard library - SE-0133: Rename
flatten()tojoined() - SE-0134: Rename two UTF8-related properties on String
- SE-0135: Package Manager Support for Differentiating Packages by Swift version
- SE-0136: Memory Layout of Values
- SE-0137: Avoiding Lock-In to Legacy Protocol Designs
官方发行说明：https://swift.org/blog/swift-3-0-released/
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