4.5 Control structures

4.5.1 General rules

• The following keywords MUST be followed by a whitespace:

            do if typeid sizeof case catch switch template for throw while try
       

  This is wrong: if(x == 3) foo3();

  This is correct: if (x == 3) foo3 ();

• As an exception of the previous rule, you are allowed (even RECOMMENDED) to write template<> for explicit specializations.

            template<>
            class Foo<int>
            {
              ...
            };
       

• Each of the three parts of the for construct MAY be empty. Note that more often than not, the while construct better represents the loop resulting from a for with an empty initial part.

  These are wrong: for (;;) ; for ( ; ; ) ;

  This is correct: for (;;) ;

4.5.2 Loops, general rules

• To emphasize the previous rules, single-line loops (for and while) MUST have their terminating semicolon on the following line.

  This is wrong: for (len = 0; *str; ++len, ++str);

  These are correct: for (len = 0; *str; ++len, ++str) ;