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54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
#ifndef OAK_ITERATOR_MACROS_H_1SQFE1YN
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#define OAK_ITERATOR_MACROS_H_1SQFE1YN
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// The essential macro is foreeach, rforeach doing a reverse iteration. Example:
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//
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// std::vector<char> v;
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// foreach(it, v.begin(), v.end())
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// cout << *it;
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//
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// The iterate/riterate macros are taking a container instead, and calls beginof/endof on the container. Example:
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//
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// std::vector<char> v;
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// iterate(it, v)
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// cout << *it;
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//
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// The citerate macro is like iterate but will use a temporary variable for the result of the expression passed in as the container, take this example:
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//
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// std::vector<char> create_vector () { return std::vector<char>(32, 'a'); }
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//
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// …later…
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//
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// citerate(it, create_vector())
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// cout << *it;
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//
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// Using the regular iterate macro is not safe since we would call create_vector() twice and (likely) get incompatible begin/end iterators.
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#ifndef foreach
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#define foreach(v,f,l) for(decltype(f) v = (f), _end = (l); v != _end; ++v)
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#endif
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#ifdef iterate
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#undef iterate
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#endif
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#define iterate(v,c) foreach(v, std::begin(c), std::end(c))
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#ifndef uiterate
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#define uiterate(v,c,u) \
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decltype(c) u = (c); foreach(v, std::begin(u), std::end(u))
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#endif
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#define OAK_UNIQUE __COUNTER__
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#define OAK_MERGE_IMPL(a,c) a ## c
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#define OAK_MERGE(a,c) OAK_MERGE_IMPL(a,c)
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#ifndef citerate
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#define citerate(v,c) uiterate(v,c,OAK_MERGE(_tmp_,OAK_UNIQUE))
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#endif
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#ifndef riterate
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#define riterate(v,c) foreach(v, std::reverse_iterator<decltype(std::end(c))>(std::end(c)), std::reverse_iterator<decltype(std::begin(c))>(std::begin(c)))
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#endif
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#endif /* end of include guard: OAK_ITERATOR_MACROS_H_1SQFE1YN */
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