We went to great lengths to remove all the Windows-specific stuff from our core modules, and to shift it out into Windows-specific modules. Therefore, embedding Windows-specific code in core modules such as ssh.c is not acceptable. It has a working Unix port a Mac port is in progress more ports may or may not happen at a later date. If you are planning to send code contributions, you should read this first.ĭespite Windows being its main area of fame, PuTTY is no longer a Windows-only application suite. This appendix lists a selection of the design principles applying to the PuTTY source code. D.13 Single compilation of each source file.D.10 640×480 friendliness in configuration panels.D.9 Keystrokes sent to the server wherever possible.D.3 Multiple sessions per process on some platforms.In Kotlin, the type system distinguishes between references that can hold null (nullable references) and those that cannot (non-null references). Other issues caused by external Java code. For example, a piece of Java code might add null into a Kotlin MutableList, therefore requiring a MutableList for working with it. Nullability issues with generic types being used for Java interoperation. Usage of the !! operator that is described below.ĭata inconsistency with regard to initialization, such as when:Īn uninitialized this available in a constructor is passed and used somewhere (a 'leaking this').Ī superclass constructor calls an open member whose implementation in the derived class uses an uninitialized state.Īttempts to access a member of a null reference of a platform type

The only possible causes of an NPE in Kotlin are:Īn explicit call to throw NullPointerException(). In Java this would be the equivalent of a NullPointerException, or an NPE for short. One of the most common pitfalls in many programming languages, including Java, is that accessing a member of a null reference will result in a null reference exception. Kotlin's type system is aimed at eliminating the danger of null references, also known as The Billion Dollar Mistake. Null safety Nullable types and non-null types

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