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By Beazley D.M.

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SWIG is certainly not guaranteed to work with every conceivable type of C++ program (especially those that use C++ in a maximal manner). Nor is SWIG claiming to build C++ interfaces in a completely “safe” manner. The bottom line is that effective use of C++ with SWIG requires that you know what you’re doing and that you have a certain level of “moral flexibility” when it comes to the issue of building a useful scripting language interface. The future of C++ and SWIG SWIG’s support of C++ is best described as an ongoing project.

However, we can can accomplish the same thing by simply using the Shape_area function on either object. Templates SWIG does not support template definitions--that is, it does not support anything that would be declared in C++ using the ‘template’ keyword. If a template definition is found, SWIG will issue a warning message and attempt to ignore the contents of the entire declaration. h #define MAXITEMS 100 template class List { private: T *data; int nitems; public: List() { data = new T [MAXITEMS]; nitems = 0; } ~List() { delete [] data; }; void append(T obj) { if (nitems < MAXITEMS) { data[nitems++] = obj; } } int length() { return nitems; } T get(int n) { return data[n]; } }; // Entire class is ignored by SWIG However, SWIG can support instantiations of a template and types involving templates.

When converting from C, all of the above datatypes are cast into the representation used by the target scripting language. Thus, a 16 bit short in C may be converted to a 32 bit integer. When integers are converted from the scripting language back into C, the value will be cast into the appropriate type. The value will be truncated if it is too large to fit into the corresponding C datatype. This truncation is not currently checked. The unsigned char and signed char datatypes are special cases that are treated as integers by SWIG.

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SWIG users manual by Beazley D.M.


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