funcprecondition(_:_:file:line:)(_condition: @autoclosure() ->Bool,_message: @autoclosure() ->String=String(),file:StaticString= #file,line:UInt= #line)
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func precondition(_:_:file:line:)(_ condition: @autoclosure () -> Bool, _ message: @autoclosure () -> String = String(), file: StaticString = #file, line: UInt = #line)
Checks a necessary condition for making forward progress.
Use this function to detect conditions that must prevent the program from proceeding, even in shipping code.