1. #ifndef
2. #define
3. #endif
4. #include

Abbreviated form used elsewhere in this manual: "Only the following pre-processor directives shall be used: #ifndef, #define, #endif, #include."

• Only a mixture of case
• The presence/absence of the underscore character
• The interchange of the letter 'O', with the number '0' or the letter 'D'
• The interchange of the letter 'I', with the number '1' or the letter 'l'
• The interchange of the letter 'S' with the number '5'
• The interchange of the letter 'Z' with the number 2
• The interchange of the letter 'n' with the letter 'h'.

Abbreviated form used elsewhere in this manual: "Identifiers will not be typographically ambiguous."

• the same object,
• the same function,
• members of the same object, or
• elements of the same array (including one past the end of the same array).

Abbreviated form used elsewhere in this manual: "Relational operators shall not be applied to pointer types except where both operands are of the same type and point to the same entity."

• Virtual functions that act like dynamic casts (most likely useful in relatively simple cases)
• Use of the visitor (or similar) pattern (most likely useful in complicated cases)

Abbreviated form used elsewhere in this manual: "Down casting (casting from base to derived class) shall only be allowed through certain mechanisms."

for (Iter_type p = c.begin() ; p != c.end() ; ++p) // Good
{
...
}

Abbreviated form used elsewhere in this manual: "The initialization expression in a for loop will perform no actions other than to initialize the value of a single for loop parameter."

1. by itself
2. the right-hand side of an assignment
3. a condition
4. the only argument expression with a side-effect in a function call
5. condition of a loop
6. switch condition
7. single part of a chained operation.

Abbreviated form used elsewhere in this manual: "A single operation with side-effects shall only be used in certain contexts."