Can replacing statements with expressions with the C ++ comma operator allow more optimized compilation?

Question

The C ++ comma operator is used to combine individual expressions, resulting in the result of the value of the last expression executed.

For example, skeletal code (6 operators, 6 expressions):

step1;
step2;
if (condition)
    step3;
    return step4; 
else
    return step5;

Can be rewritten to: (1 instruction, 6 expressions)

return step1, 
       step2,
       condition?
          step3, step4 : 
          step5;

I noticed that step-by-step debugging of such code is not possible, since the expression chain seems to be executed as a whole. Does this mean that the compiler is capable of performing special optimizations that are impossible with the traditional approach to description (especially if the steps are constant or inline)?

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Answer 1

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Answer 2

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, , , , - , . ( ? , my_func((++i, y), x).)

"" , , - for:

for (int i = 0, j = 0; 
     i < 10 && j < 12; 
     i += j, ++j) // each time through the loop we're tinkering with BOTH i and j
{
}

Answer 3

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