diff options
Diffstat (limited to 'xsd/examples/cxx/parser/mixin/driver.cxx')
-rw-r--r-- | xsd/examples/cxx/parser/mixin/driver.cxx | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/xsd/examples/cxx/parser/mixin/driver.cxx b/xsd/examples/cxx/parser/mixin/driver.cxx new file mode 100644 index 0000000..41e5a45 --- /dev/null +++ b/xsd/examples/cxx/parser/mixin/driver.cxx @@ -0,0 +1,104 @@ +// file : examples/cxx/parser/mixin/driver.cxx +// author : Boris Kolpackov <boris@codesynthesis.com> +// copyright : not copyrighted - public domain + +#include <memory> +#include <iostream> + +#include "types.hxx" +#include "schema-pskel.hxx" + +using namespace std; + +struct base_pimpl: virtual base_pskel +{ + virtual void + pre () + { + base_.reset (new ::base); + } + + virtual void + a (bool v) + { + base_->a (v); + } + + virtual base* + post_base () + { + return base_.release (); + } + +protected: + auto_ptr<base> base_; +}; + +// Implement derived parser by mixing-in base's implementation. +// +struct derived_pimpl: derived_pskel, base_pimpl +{ + virtual void + pre () + { + // Override base's pre() with the new implementation that + // instantiates derived instead of base. + // + base_.reset (new ::derived); + } + + virtual void + b (int v) + { + // We could also store a pointer to derived in derived_impl to + // avoid casting. + // + static_cast< ::derived* > (base_.get ())->b (v); + } + + virtual derived* + post_derived () + { + return static_cast<derived*> (base_.release ()); + } +}; + +int +main (int argc, char* argv[]) +{ + if (argc != 2) + { + cerr << "usage: " << argv[0] << " instance.xml" << endl; + return 1; + } + + try + { + // Construct the parser. + // + xml_schema::boolean_pimpl bool_p; + xml_schema::int_pimpl int_p; + derived_pimpl derived_p; + + derived_p.parsers (bool_p, int_p); + + xml_schema::document doc_p (derived_p, "root"); + + derived_p.pre (); + doc_p.parse (argv[1]); + auto_ptr<derived> d (derived_p.post_derived ()); + + cerr << "a: " << boolalpha << d->a () << endl; + cerr << "b: " << d->b () << endl; + } + catch (const xml_schema::exception& e) + { + cerr << e << endl; + return 1; + } + catch (const std::ios_base::failure&) + { + cerr << argv[1] << ": unable to open or read failure" << endl; + return 1; + } +} |