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adiog/copy-based-history.hh

Created November 8, 2017 03:12
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copy-based-history.hh
#include <cassert>
template <typename T>
using history_t = std::vector<T>;
template <typename T>
void commit(history_t<T>& h) { assert(h.size()); h.push_back(h.back()); }
template <typename T>
void undo(history_t<T>& h) { assert(h.size()); h.pop_back(); }
template <typename T>
T& current(history_t<T>& h) { assert(h.size()); return h.back();}
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