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125 lines
3.8 KiB
Python
125 lines
3.8 KiB
Python
from gen_function import *
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import string
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def gen_callback(args):
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return (
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"""// (C) Copyright David Abrahams 2000. Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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// The author gratefully acknowleges the support of Dragon Systems, Inc., in
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// producing this work.
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//
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// This file was generated for %d-argument python callbacks by gen_callback.py
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#ifndef CALLBACK_DWA_052100_H_
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# define CALLBACK_DWA_052100_H_
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# include "pyconfig.h"
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# include "py.h"
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namespace py {
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namespace detail {
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template <class T>
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inline void callback_adjust_refcount(PyObject*, Type<T>) {}
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inline void callback_adjust_refcount(PyObject* p, Type<PyObject*>)
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{ Py_INCREF(p); }
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}
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// Calling Python from C++
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template <class R>
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struct Callback
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{""" % args
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+ gen_functions('''
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%{ template <%(class A%n%:, %)>
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%} static R call_method(PyObject* self, const char* name%(, const A%n& a%n%))
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{%(
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Ptr p%n(to_python(a%n));%)
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Ptr result(PyEval_CallMethod(self, const_cast<char*>(name),
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const_cast<char*>("(%(O%))")%(,
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p%n.get()%)));
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detail::callback_adjust_refcount(result.get(), Type<R>());
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return from_python(result.get(), Type<R>());
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}
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%{ template <%(class A%n%:, %)>
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%} static R call(PyObject* self%(, const A%n& a%n%))
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{%(
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Ptr p%n(to_python(a%n));%)
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Ptr result(PyEval_CallFunction(self, const_cast<char*>("(%(O%))")%(,
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p%n.get()%)));
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detail::callback_adjust_refcount(result.get(), Type<R>());
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return from_python(result.get(), Type<R>());
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}
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''', args)
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+
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"""};
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// This specialization wouldn't be needed, but MSVC6 doesn't correctly allow the following:
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// void g();
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// void f() { return g(); }
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template <>
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struct Callback<void>
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{
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"""
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+ gen_functions('''
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%{ template <%(class A%n%:, %)>
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%} static void call_method(PyObject* self, const char* name%(, const A%n& a%n%))
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{%(
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Ptr p%n(to_python(a%n));%)
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Ptr result(PyEval_CallMethod(self, const_cast<char*>(name),
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const_cast<char*>("(%(O%))")%(,
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p%n.get()%)));
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}
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%{ template <%(class A%n%:, %)>
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%} static void call(PyObject* self%(, const A%n& a%n%))
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{%(
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Ptr p%n(to_python(a%n));%)
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Ptr result(PyEval_CallFunction(self, const_cast<char*>("(%(O%))")%(,
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p%n.get()%)));
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}
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''', args)
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+
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"""};
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// Make it a compile-time error to try to return a const char* from a virtual
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// function. The standard conversion
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//
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// from_python(PyObject* string, py::Type<const char*>)
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//
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// returns a pointer to the character array which is internal to string. The
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// problem with trying to do this in a standard callback function is that the
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// Python string would likely be destroyed upon return from the calling function
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// (py::Callback<const char*>::call[_method]) when its reference count is
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// decremented. If you absolutely need to do this and you're sure it's safe (it
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// usually isn't), you can use
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//
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// py::String result(py::Callback<py::String>::call[_method](...args...));
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// ...result.c_str()... // access the char* array
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template <>
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struct Callback<const char*>
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{
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// Try hard to generate a readable error message
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typedef struct unsafe_since_python_string_may_be_destroyed {} call, call_method;
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};
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} // namespace py
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#endif // CALLBACK_DWA_052100_H_
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""")
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if __name__ == '__main__':
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import sys
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if len(sys.argv) == 1:
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args = 5
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else:
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args = int(sys.argv[1])
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print gen_callback(args)
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