How to use const to define objects in C++

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Con.4: if the value of an object does not change after it is built, define it using const

Reason (reason)

Prevent surprises from unexpectedly changed object values.

Prevents the value of an object from being accidentally modified.

Example (sample)

Void f ()

{

Int x = 7

Const int y = 9

For (;;) {

/ /...

}

/ /...

}

As x is not const, we must assume that it is modified somewhere in the loop.

Since x is not defined as a constant type, we must assume that it may be modified somewhere in the loop.

Enforcement (implementation recommendations)

Flag unmodified non-const variables.

A non-constant for which the tag is not modified.

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