62 lines
2.7 KiB
Plaintext
62 lines
2.7 KiB
Plaintext
This directory contains a few example MzScheme extensions. Most
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examples are implemented directly in C. A few examples listed at the
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end use the mzc `c-lambda', etc. forms.
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* hello.c - returns the string "Hello, World!". Demonstrates creating
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a Scheme value.
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* fmod.c - defines the `fmod' procedure, which calculates modulo on
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floating-point numbers. Demonstrates creating Scheme procedures
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from C and adding top-level definitions. (Manually instrumented for
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3m, so do not use `mzc --xform'.)
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* curses.c - links MzScheme to the curses library. Demonstrates more
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procedures and definitions, a little more type dispatching, and
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returning multiple values. (Manually instrumented for 3m, so do not
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use `mzc --xform'.)
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* makeadder.c - defines `make-adder', which takes a number and
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returns a procedure that takes another number to add to
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it. Demonstrates closure creation in C, getting Scheme global
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values, and calling Scheme procedures from C.
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makeadder3m.c - the same, but manually instrumented 3m (so do not
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use `mzc --xform'). Making the code work with 3m requires several
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changes, but `mzc --xform' works on "makeadder.c" without changes.
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* catch.c - defined `eval-string/catch-error', which catches
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exceptions while evaluating a string. Demonstrates how to catch
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exceptions from C code.
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* bitmatrix.c - implements two-dimentional bit matrixes with some
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operations. Demonstrates defining a new Scheme data type, data
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allocation, fancy integer type checking, general exception raising,
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and registering static variables. Also demonstrates supplying
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traversal functions for 3m (but still needs `mzc --xform'
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preprocessing to build for 3m).
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* idmodule.c - Declares the module named `idmodule' that provides an
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`identity' function. Demonstrates implementing a primitive module
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in C.
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* helloprint.c - prints "Hello, World!" directly to the current
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output port rather than relying on the read-eval-print-loop.
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Demonstrates using built-in Scheme parameter values from C.
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* tree.cxx, tree-finish.ss - shows how to inject a C++ class into
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MzLib's class.ss world. (Does not work with 3m.)
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* fmod-ez.ss - same as fmod.c, but with 10% of the code. Demonstrates
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`c-lambda'.
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* cfile.ss - simple (and unsafe) glue to the fopen(), fread(),
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fwrite(), and fclose() C library functions. Demonstrates the use of
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`(pointer ...)' types. Technically, this example is broken for 3m,
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because fclose() frees the FILE* pointer, and it's possible that
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the GC will later try to use the same memory.
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* msgbox.ss - a Windows-only example, provides a `message-box'
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procedure. Demonstrates some of the limitations of `c-lambda' and
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how to work around them.
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