Last update October 18, 2011

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DIP12: C API headers

Title:C API headers
Last Modified:2011-10-18
Author:Martin Nowak
Links: The CAPI Manifesto


Create a place to gather D import files for publicly available C libraries.


D is binary compatible with C ABI code. This allows to reuse the huge amount of high quality public C libraries. Providing a central place to publish D import files can leverage the tedious work of translating.


A repository was created under It was proposed to use the following directory structure.


    |--- library name
        |--- C
            |--- foo.h
                |--- bar
                    |--- baz.h
        |--- D
            |--- foo.d
                |--- bar
                    |--- baz.d

Each '#include <path/to/header.h>' should have a corresponding 'import;'

Possibly all files could be rooted under a package 'cabi', i.e. 'import;'.

The D import files should try to do as least modifications as possible to simplify updates of the C headers. This includes leaving comments intact.

Translated header should not require linkage of any D binary. Necessary D functions can be written as nullary templates.

  #define GET(x) x.value => int GET()(X x) { return x.value; }

Version tags should match the ones being used by the C headers.

The copyright for the D import files should match the one being used by the C header as they are derived work.

If the C header file has a name that is a D keyword, an underscore will be appended to the D module name.

If a C type name matches a C function name (stat), the type name will have a "_t" appended.

Open Questions

Who is going to maintain the repository?

 - Starting with the phobos dev team.

How will added/modified headers be reviewed/tested?


What can be reused of the dsource/bindings project?



Each library should contain a README in the root folder. The README file should contain exact source and version of the C library. Furthermore it should contain specific notes about the usage of the D import file.

Every library should contain a simple D example under CAPI/library/examples. This could be used for basic self testing.


This document has been placed in the Public Domain.

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