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Contains: 0 1 2 3 4 5 6 7 8 9 Contains: 0 1 3 4 6 7 8 9 |
This result arises because std::remove_if makes two copies of the predicate before invoking it. The first copy is used to determine the location of the first element in the sequence for which the predicate returns true. The subsequent copy is used for removing other elements in the sequence. This results in the third element (2) and sixth element (5) being removed; two distinct predicate functions are used.
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The above compliant solution demonstrates using a reference wrapper over a functor object but can similarly be used with a stateful lambda. The code produces the expected results, where only the third element is removed:.
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Contains: 0 1 2 3 4 5 6 7 8 9 |
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Contains: 0 1 3 4 5 6 7 8 9 |
Compliant Solution (Iterator Arithmetic)
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