Pass `func` as `const &` in `modify` function
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@ -807,7 +807,7 @@ public:
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}
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//! Modifies an item "in place" updating indexes.
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void modify(IDType id, std::function<void(T &)> func)
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void modify(IDType id, const std::function<void(T &)> &func)
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{
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T t;
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if (!this->get(id, t))
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