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Text of the page (random words):
ble pivot 5 int mysum int a int b pure nothrow pure function ref to enclosing scope if b pivot return a b else return a passing a delegate closure auto result reduce mysum chain a1 a2 writeln result result result 15 passing a delegate literal result reduce a b b pivot a b a chain a1 a2 writeln result result result 15 alternatively the above function compositions can be expressed using uniform function call syntax ufcs for more natural left to right reading auto result a1 chain a2 reduce mysum writeln result result result a1 chain a2 reduce a b b pivot a b a writeln result result parallelism edit parallel programming concepts are implemented in the library and do not require extra support from the compiler however the d type system and compiler ensure that data sharing can be detected and managed transparently import std stdio writeln import std range iota import std parallelism parallel void main foreach i iota 11 parallel the body of the foreach loop is executed in parallel for each i writeln processing i iota 11 parallel is equivalent to std parallelism parallel iota 11 by using ufcs the same module also supports taskpool which can be used for dynamic creation of parallel tasks and for map filter reduce and fold style operations on ranges and arrays which is useful when combined with functional operations std algorithm map returns a lazily evaluated range rather than an array this way the elements are computed by each worker task in parallel automatically import std stdio writeln import std algorithm map import std range iota import std parallelism taskpool on intel i7 3930x and gdc 9 3 0 5140ms using std algorithm reduce 888ms using std parallelism taskpool reduce on amd threadripper 2950x and gdc 9 3 0 2864ms using std algorithm reduce 95ms using std parallelism taskpool reduce void main auto nums iota 1 0 1_000_000_000 0 auto x taskpool reduce a b 0 0 map 1 0 a a nums writeln sum x concurrency edit concurrency is fully implemented in the library and it does not require support from the compiler alternative implementations and methodologies of writing concurrent code are possible the use of d typing system does help ensure memory safety import std stdio std concurrency std variant void foo bool cont true while cont delegates are used to match the message type receive int msg writeln int received msg tid sender cont false sender send 1 variant v writeln huh variant matches any type void main auto tid spawn foo spawn a new thread running foo foreach i 0 10 tid send i send some integers tid send 1 0f send a float tid send hello send a string tid send thistid send a struct tid receive int x writeln main thread received message x metaprogramming edit metaprogramming is supported through templates compile time function execution tuples and string mixins the following examples demonstrate some of d s compile time features templates in d can be written in a more imperative style compared to the c functional style for templates this is a regular function that calculates the factorial of a number ulong factorial ulong n if n 2 return 1 else return n factorial n 1 here the use of static if d s compile time conditional construct is demonstrated to construct a template that performs the same calculation using code that is similar to that of the function above template factorial ulong n static if n 2 enum factorial 1 else enum factorial n factorial n 1 in the following two examples the template and function defined above are used to compute factorials the types of constants need not be specified explicitly as the compiler infers their types from the right hand sides of assignments enum factorial7 factorial 7 this is an example of compile time function execution ctfe ordinary functions may be used in constant compile time expressions provided they meet certain criteria enum factorial9 factorial 9 the std string format function performs printf like data formatting also at compile time through ctfe and the msg pragma displays the result at compile time import std string format pragma msg format 7 s fact_7 pragma msg format 9 s fact_9 string mixins combined with compile time function execution allow for the generation of d code using string operations at compile time this can be used to parse domain specific languages which will be compiled as part of the program hypothetical module which contains a function that parses foo source code and returns equivalent d code import footod void main mixin footod import example foo memory management edit memory is usually managed with garbage collection but specific objects may be finalized immediately when they go out of scope this is what the majority of programs and libraries written in d use explicit memory management is possible using the overloaded operator new by calling c s malloc and free directly or implementing custom allocator schemes such as stack allocation with fallback raii style allocation reference counting or shared reference counting garbage collection can be controlled programmers may add and exclude memory ranges from being observed by the collector can disable and enable the collector and force either a generational or full collection cycle 15 the language documentation provides examples of how to implement alternative memory management schemes for scenarios where garbage collection is not preferred 16 in functions struct instances are by default allocated on the stack while class instances by default allocated on the heap with only reference to the class instance being on the stack however this can be changed for classes for example using standard library template std typecons scoped or by using new for structs and assigning to a pointer instead of a value based variable 17 in functions static arrays of known size are allocated on the stack for dynamic arrays one can use the core stdc stdlib alloca function similar to alloca in c to allocate memory on the stack the returned pointer can be used recast into a typed dynamic array by means of a slice however resizing array including appending must be avoided and for obvious reasons they must not be returned from the function 17 a scope keyword can be used both to annotate parts of code but also variables and classes structs to indicate they should be destroyed destructor called immediately on scope exit whatever the memory is deallocated also depends on implementation and class vs struct differences 18 std experimental allocator contains modular and composable allocator templates to create custom allocators for specific use cases 19 safed edit safed 20 is the name given to the subset of d that can be guaranteed to be memory safe functions marked safe are checked at compile time to ensure that they do not use any features that could result in corruption of memory such as pointer arithmetic and unchecked casts any other functions called must also be marked as safe or trusted functions can be marked trusted for the cases where the compiler cannot distinguish between safe use of a feature that is disabled in safed and a potential case of memory corruption 21 scope lifetime safety edit initially under the banners of dip1000 22 and dip25 23 now part of the language specification 24 d provides protections against certain ill formed constructions involving the lifetimes of data the current mechanisms in place primarily deal with function parameters and stack memory however the language design roadmap includes plans to expand lifetime tracking within the d programming language drawing on concepts from the rust programming language 25 influenced by ideas from rust programming language lifetime safety of assignments edit within safe code the lifetime of an assignment involving a reference type is checked to ensure that the lifetime of the assignee is longer than that of the assigned for example safe void test int tmp 0 1 int rad 2 rad tmp if the order of the declarations of 1 and 2 is reversed this fails int bad 45 the lifetime of bad only extends to the scope in which it is defined rad bad this is valid rad bad the lifetime of rad is longer than bad hence this is not valid function parameter lifetime annotations within safe code edit when applied to function parameter which are either of pointer type or references the keywords return and scope constrain the lifetime and use of that parameter the language standard dictates the following behaviour 26 storage class behaviour and constraints to of a parameter with the storage class scope references in the parameter cannot be escaped ignored for parameters with no references return parameter may be returned or in case of void functions copied to the first parameter but otherwise does not escape from the function such copies are required not to outlive the argument s they were derived from ignored for parameters with no references an annotated example is given below safe int gp void thorin scope int void gloin int int balin return scope int p scope int q int r gp p error p escapes to global variable gp gp q error q escapes to global variable gp gp r ok thorin p ok p does not escape thorin thorin q ok thorin r ok gloin p error p escapes gloin gloin q error q escapes gloin gloin r ok that r escapes gloin return p ok return q error cannot return scope q return r ok interaction with other systems edit c s application binary interface abi is supported as well as all of c s fundamental and derived types enabling direct access to existing c code and libraries d bindings are available for many popular c libraries additionally c s standard library is part of standard d on microsoft windows d can access component object model com code as long as memory management is properly performed many other languages can be mixed with d in a single binary for example the gdc compiler allows to link and intermix c c and other supported language codes such as objective c d code functions can also be marked as using c c pascal abis and thus be passed to the libraries written in these languages as callbacks similarly data can be interchanged between the codes written in these languages in both ways this usually restricts use to primitive types pointers some forms of arrays unions structs and only some types of function pointers because many other programming languages often provide the c application programming interface api for writing extensions or running the interpreter of the languages d can interface directly with these languages also using standard c bindings with a thin d interface file for example bi directional bindings exist for the languages python 27 lua 28 29 and others often using compile time code generation and compile time type reflection methods interaction with c code edit for d code marked as extern c the following features are specified the name mangling conventions shall match those of c on the target for function calls the abi shall be equivalent the vtable shall be matched up to single inheritance the only level supported by the d language specification c namespaces are used via the syntax extern c namespace where namespace is the name of the c namespace an example of c interoperation edit on c import std class base public virtual void print3i int a int b int c 0 class derived public base private int field public explicit derived int field field field void print3i int a int b int c std println a a std println b b std println c c int mul int factor return field factor derived createinstance int i return new derived i void deleteinstance derived d delete d d 0 on d extern c abstract class base public void print3i int a int b int c class derived base private int field public disable this override void print3i int a int b int c final int mul int factor derived createinstance int i void deleteinstance ref derived d void main import std stdio auto d1 createinstance 5 writeln d1 field writeln d1 mul 4 base b1 d1 b1 print3i 1 2 3 deleteinstance d1 assert d1 is null auto d2 createinstance 42 writeln d2 field deleteinstance d2 assert d2 is null better c edit the d programming language has an official subset known as better c 30 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 better c may only call into d code compiled under the same flag and linked code other than d but code compiled without the 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 edit 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 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 edit garbage collection typeinfo and moduleinfo built in threading e g core thread dynamic arrays though slices of static arrays work and associative arrays exceptions synchronized and core sync static module constructors or destructors history edit walter bright started working on a new language in 1999 d was first released in december 2001 1 and reached version 1 0 in january 2007 31 the first version of the language d1 concentrated on the imperative object oriented and metaprogramming paradigms 32 similar to c some members of the d community created an alternative runtime and standard library named tango as an alternative to phobos d s official runtime and standard library the first public tango announcement came within days of d 1 0 s release 33 tango adopted a different programming style embracing oop and high modularity being a community led project tango was more open to contributions which allowed it to progress faster than the official standard library at that time tango and phobos were incompatible due to different runtime support apis the garbage collector threading support etc this made it impossible to use both libraries in the same project the existence of two widely used libraries meant that some packages used phobos and others used tango creating an incompatibility across different projects 34 in june 2007 the first version of d2 was released 35 the beginning of d2 s development signaled d1 s stabilization the first version of the language has been placed in maintenance only receiving corrections and implementation bugfixes d2 introduced breaking changes to the language beginning with its first const system d2 later added numerous other language features such as closures purity and support for the functional and concurrent programming paradigms d2 also solved standard library problems...
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