DCL37-CPP. Do not use names reserved for the implementation

The C++ Standard [[ISO/IEC 14882-2003]] Section 17.4.3.1.2, "Global names" says: "Each name that contains a double underscore (_ _) or begins with an underscore followed by an uppercase letter is reserved to the implementation for any use." Trying to use a name of this form may lead to that name conflicting with one used by the implementation, with unpredictable results that may, but may not, be detected at compile time.

Non-Compliant Code Example

In this example, an object is defined with a name that is reserved for the implementation.

int _Page_Count;
// ...

Compliant Solution

To correct this error, use names not beginning with an underscore followed by an uppercase letter and not containing a double underscore.

int PageCount;
// ...

Risk Assessment

Using a name reserved for the implementation may lead to unpredictable results.

References

[[ISO/IEC 14882-2003]] Section 17.4.3.1.2, "Global names"

DCL16-CPP. Use 'L', not 'l', to indicate a long value      02. Declarations and Initialization (DCL)      DCL31-C. Avoid self initialization