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float const pi = 3.14159f;
float degrees;
float radians;
/* ... */
radians = degrees * pi / 180;

Automated Detection

Compass/ROSE could detect violations of this rule by flagging any variable as a violation as long as:

• the variable is local to a function, or static (but not extern)
• It is never assigned to
• Its address is never evaluated.
  These violations will be genuine, but ROSE can't catch all violations. In particular:
• A variable whose address is taken might still be const
• Variables appearing in multiple files might still be const.
• Doesn't handle constant data on the heap

Risk Assessment

Failing to const-qualify immutable objects can result in a constant being modified at runtime.

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