With `codegen`, one can generate code from a sympy expression. Typically,
it is assumed that the return value is a scalar.
In one of my use cases, the return value is Boolean. (The answer to "Is x
inside a particular domain?")
The hack I employed so far is to generate the code as usual
```
from sympy import *
from sympy.utilities.codegen import codegen
x = Symbol('x')
expr = x**2 - x + sin(x) < x**3 - 2*x - cos(5*x) # ok
[(c_name, c_code), (h_name, c_header)] = codegen(("f", expr), "C")
print(c_code)
```
and then regex the relevant part out of `c_code`. (If you know of a better
way to handle this, I'll be happy to hear about it.)
This works alright, but fails in the most simple cases, e.g.,
```
expr = True
```
with
```
TypeError: The first argument must be a sympy expression.
```
Quite understandable.
Is there a better way/hack to support this kind of code generation?
Cheers,
Nico
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