Interfacing D with C: Arrays Part 1

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When interacting with C APIs, it’s almost a given that arrays are going to pop up in one way or another (perhaps most often as strings, a subject of a future article in the “D and C” series). Although D arrays are implemented in a manner that is not directly compatible with C, the fundamental building blocks are the same. This makes compatibility between the two relatively painless as long as the differences are not forgotten. This article is the first of a few exploring those differences.

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Interfacing D with C: Getting Started

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One of the early design goals behind the D programming language was the ability to interface with C. To that end, it provides ABI compatibility, allows access to the C standard library, and makes use of the same object file formats and system linkers that C and C++ compilers use. Most built-in D types, even structs, are directly compatible with their C counterparts and can be passed freely to C functions, provided the functions have been declared in D with the appropriate linkage attribute. In many cases, one can copy a chunk of C code, paste it into a D module, and compile it with minimal adjustment. Conversely, appropriately declared D functions can be called from C.

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