c_begin_end [Doku Wiki]

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===== Overview =====

How ''begin'' and ''end'' are used in range-''for'' statements.

===== The rules (from TC++PL4) =====

The expression after the colon must denote a sequence (a range); that is, it must yield a value for which we can call v.begin() and v.end() or begin(v) and end(v) to obtain iterators (§4.5):

  * the compiler ﬁrst looks for members ''begin'' and ''end'' and tries to use those. If a ''begin'' or an ''end'' is found that cannot be used as a range (e.g., because a member ''begin'' is a variable rather than a function), the range-''for'' is an error.
  * Otherwise, the compiler looks for a ''begin/end'' member pair in the enclosing scope. If none is found or if what is found cannot be used (e.g., because the ''begin'' did not take an argument of the sequence’s type), the range-''for'' is an error.

Add more regarding standard library header ''<iterator>''.