类 Python || 和 && for if 在 C++ 中

Question

Is the following Python-like construct slower in C++?

bool_stuff[i] || (a[i]=1);

compared the plain old

if(!bool_stuff[i])
  a[i]=1;

The reason is, I have the above snippet in a nested for loop with this being the only statement. I think the readability is greater in the former case, but shall use the latter only if the former is not safe or if it is slow.

Answer 1

They compile to the same thing (If you use any optimisation above -O0 in gcc, and probably in other compilers).

Other disadvantages of the first method is that the expression on the right has to be convertible to a bool (Calling operator bool if it has side effects for no reason), and, if operator|| is overloaded, it will not actually short circuit.

The if statement is much more readable and the same speed.