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    <p>The <a href="http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml?showone=Preincrement_and_Predecrement#Preincrement_and_Predecrement" rel="noreferrer">Google C++ Style Guide</a> says:</p> <blockquote> <p><strong>Preincrement and Predecrement</strong></p> <p>Use prefix form (++i) of the increment and decrement operators with iterators and other template objects.</p> <p><strong>Definition:</strong> When a variable is incremented (++i or i++) or decremented (--i or i--) and the value of the expression is not used, one must decide whether to preincrement (decrement) or postincrement (decrement).</p> <p><strong>Pros:</strong> When the return value is ignored, the "pre" form (++i) is never less efficient than the "post" form (i++), and is often more efficient. This is because post-increment (or decrement) requires a copy of i to be made, which is the value of the expression. If i is an iterator or other non-scalar type, copying i could be expensive. Since the two types of increment behave the same when the value is ignored, why not just always pre-increment?</p> <p><strong>Cons:</strong> The tradition developed, in C, of using post-increment when the expression value is not used, especially in for loops. Some find post-increment easier to read, since the "subject" (i) precedes the "verb" (++), just like in English.</p> <p><strong>Decision:</strong> For simple scalar (non-object) values there is no reason to prefer one form and we allow either. For iterators and other template types, use pre-increment.</p> </blockquote>
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    1. CO"Decision: For simple scalar (non-object) values there is no reason to prefer one form and we allow either. For iterators and other template types, use pre-increment."
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