Anything equivalent to cassert in C++?

[MRAB]

Grant Edwards wrote:
> On 2009-11-26, Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:
>> Peng Yu wrote:
>>> There are some assertion code (testing if a condition is false, if it
>>> is false, raise an Error object) in my python, which is useful when I
>>> test my package.  But such case would never occur when in the produce
>>> code. If I keep them in if statement, it will take some runtime. I'm
>>> wondering what is the practice that take care of the assertion code in
>>> python.
>> Would never occur? You can't use 'would' and 'never' in the
>> same sentence.
> 
> Why not?  "Would never" is a very common English phrase, and
> the OP used it correctly.
> 
As in "I would never tell a francophone how to speak French". :-)