Created
May 27, 2016 07:07
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Get value for a negative index or for an index larger than the size of container in C++
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| template <typename Iter> | |
| Iter cyclic(Iter begin, Iter end, int i) | |
| { | |
| auto n = std::distance(begin, end); | |
| while (i < 0) i += n; | |
| return begin + (i % n); | |
| } |
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Use .cbegin() and .cend() for a vector, pointer arithmetic for a C-style array and std::begin() and std::end() for valarray.