Does the Julia language guarantee evaluation order where parentheses are used to isolate subexpressions? For example, if one writes
d = a + (b - c)
can we be sure that the subtraction is performed first? This is important in implementing algorithms where one attempts to control roundoff.
I didn’t find a statement to this effect in the manual, but it appears to be the case in my (very limited) investigations. Note that some languages (e.g. Fortran) do have such a guarantee, but others (e.g. C, at least when I learned it) do not. Even if it’s true in practice now, without a guarantee (and tests!) some future “optimization” may break it.
Are you sure about your statement about C? I only know of undefined order in which modifying operators take effect, e.g. (++i)*(++i) is not defined, but I would first consult a reference on the question wether a + (b + c) can legally evaluated as (a + b) + c in C.