C + +: Why Goto is useless

To understand whether a feature is available, you should first analyze all the features it can achieve.

Goto can achieve only two functions: one, jump forward, two, jump to the back. These two cases correspond to three functions: one, repeated execution is the loop, two, skipping a piece of code is conditional judgment, three, skipping a loop of code is also jumping out of the loop. Now that there is a loop system like while, there are similar if. else, such as the condition of judgment, there are similar to break out of the cycle, such as the nature of the "goto" is not strict and troublesome design because the function is completely covered and eliminated.

Actually Goto should be the old ancestor of all the functional systems that cover it, including all possible, just because the function too much classification is unclear, resulting in the use of inconvenient so was replaced by the separate. From the very nature of the machine code, the original form of the implementation of all functions is the jump of code.

The only difference is that if: Else is an additional feature that is added only through its own selective jump mechanism, and also includes the Goto function. The Goto itself also relies on the If this additional judgment function.

C + +: Why Goto is useless