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Memory Safety for a program is defined as it being impossible for the program to corrupt memory. Therefore, the Safe D consists only of programming language features that are guaranteed to never result in memory corruption.

Safe D is enabled on a per-module basis by compiling with the -safe compiler switch.

Proscribed Forms

A safe module can import and use the public interface of a system module.


Safe D does not imply that code is portable, uses only sound programming practices, is free of byte order dependencies, or other bugs. It is focussed only on eliminating memory corruption possibilities.

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