CommandLine.swift

//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

import SwiftShims

/// Command-line arguments for the current process.
@frozen // namespace
publicenumCommandLine{
 /// The backing static variable for argument count may come either from the
 /// entry point or it may need to be computed e.g. if we're in the REPL.
@usableFromInline
internalstaticvar_argc:Int32=Int32()

 /// The backing static variable for arguments may come either from the
 /// entry point or it may need to be computed e.g. if we're in the REPL.
 ///
 /// Care must be taken to ensure that `_swift_stdlib_getUnsafeArgvArgc` is
 /// not invoked more times than is necessary (at most once).
@usableFromInline
internalstaticvar_unsafeArgv:
UnsafeMutablePointer<UnsafeMutablePointer<Int8>?>
=_swift_stdlib_getUnsafeArgvArgc(&_argc)

 /// Access to the raw argc value from C.
publicstaticvarargc:Int32{
 _ =CommandLine.unsafeArgv // Force evaluation of argv.
return _argc
}

 /// Access to the raw argv value from C. Accessing the argument vector
 /// through this pointer is unsafe.
publicstaticvarunsafeArgv:
UnsafeMutablePointer<UnsafeMutablePointer<Int8>?>{
return _unsafeArgv
}

 /// Access to the Swift command line arguments.
 // Use lazy initialization of static properties to 
 // safely initialize the swift arguments.
publicstaticvararguments:[String]
=(0..<Int(argc)).map{String(cString:_unsafeArgv[$0]!)}
}