On Tuesday, October 1, 2013 12:07:07 AM UTC+2, Jason Moore wrote:
>
> "Or maybe even try to define a standard to write Python code in order to
> make it easy to translate it to C++ through code generators?"
>
> Doesn't Cython already do this?
>
In cython, if you don't use *cdef*, all variables are translated into *
PyObject* pointers, which is practically the same as dynamic
typing. Therefore a naive usage of cython would not give any speed
improvement.
On the other hand, using *cdef* breaks compatibility with standard Python,
and code becomes Cython-only.
In order to achieve high performance types have to be static, so maybe a
solution for a C++ version of SymPy would be to add a dictionary of
remapping of the variable types, for example:
@is_cpp_translatable
class SomeClass(Basic):
@staticvars({'a': 'int', 'b': 'int', 'c': 'double'})
def simple_method(a, b):
c = a // 2 + b // 3
return c
which would give
class SomeClass : public Basic {
public:
double simple_method(int a, int b) {
double c = ((double)a)/2 + ((double)b)/2;
return c;
}
}
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