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XS is a Perl foreign function interface through which a program can call a C or C++ subroutine. XS or xsub is an abbreviation of "eXtendable Subroutine". XS also refers to a glue language for specifying calling interfaces supporting such interfaces (see below).
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The loop control keywords are treated as expressions in Perl, not as statements like in C or Java. The next keyword jumps directly to the end of the current iteration of the loop. This usually causes the next iteration of the loop to be started, but the continue block and loop condition are evaluated first.
A consequence of C's wide availability and efficiency is that compilers, libraries and interpreters of other programming languages are often implemented in C. [48] For example, the reference implementations of Python, [49] Perl, [50] Ruby, [51] and PHP [52] are written in C.
Learning Perl 6th Edition (2011), O'Reilly. Beginner-level introduction to Perl. Beginning Perl 1st Edition (2012), Wrox. A beginner's tutorial for those new to programming or just new to Perl. Modern Perl Archived December 22, 2011, at the Wayback Machine 2nd Edition (2012), Onyx Neon. Describes Modern Perl programming techniques.
For example, C++ functions called from C may not (in general) include reference parameters or throw exceptions. FFIs may be complicated by the following considerations: If one language supports garbage collection (GC) and the other does not; care must be taken that the non-GC language code does nothing to cause GC in the other to fail.
The core of PDL is written in C. Most of the functionality is written in PP, a PDL-specific metalanguage that handles the vectorization of simple C snippets and interfaces them with the Perl host language via Perl's XS compiler. Some modules are written in Fortran, with a C/PP interface layer. Many of the supplied functions are written in PDL ...
A snippet of C code which prints "Hello, World!". The syntax of the C programming language is the set of rules governing writing of software in C. It is designed to allow for programs that are extremely terse, have a close relationship with the resulting object code, and yet provide relatively high-level data abstraction.