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In this non-compliant example, the two iterators that delimit the range point into the same container, but the first iterator doesn't actually precede the second.
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for_each( c.end(), c.begin(), Something ); |
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The second common case arises when the iterators point into different containers:
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for_each( c.begin(), d.end(), Something ); |
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Compliant Solution
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for_each( c.begin(), c.end(), Something ); |
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