Editing D (programming language) (section)

===Better C===
The D programming language has an official subset known as "{{nowrap|Better C}}".<ref name=":0">{{Cite web|url=https://dlang.org/spec/betterc.html|title=Better C}}</ref> This subset forbids access to D features requiring use of runtime libraries other than that of C.

Enabled via the compiler flags "-betterC" on DMD and LDC, and "-fno-druntime" on GDC, {{nowrap|Better C}} may only call into D code compiled under the same flag (and linked code other than D) but code compiled without the {{nowrap|Better C}} option may call into code compiled with it: this will, however, lead to slightly different behaviours due to differences in how C and D handle asserts.

====Features included in Better C====
* Unrestricted use of compile-time features (for example, D's dynamic allocation features can be used at compile time to pre-allocate D data)
* Full metaprogramming facilities
* Nested functions, nested structs, delegates and lambdas
* Member functions, constructors, destructors, operating overloading, etc.
* The full module system
* Array slicing, and array bounds checking
* RAII
* '''{{not a typo|scope(exit)}}'''
* Memory safety protections
* Interfacing with C++
* COM classes and C++ classes
* '''assert''' failures are directed to the C runtime library
* '''switch''' with strings
* '''final switch'''
* '''unittest''' blocks
* '''printf''' format validation

====Features excluded from Better C====
* Garbage collection
* TypeInfo and ModuleInfo
* Built-in threading (e.g. <code>core.thread</code>)
* Dynamic arrays (though slices of static arrays work) and associative arrays
* Exceptions
* ''synchronized'' and <code>core.sync</code>
* Static module constructors or destructors