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//API for assocarr<mytype> myarr: |
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//myarr.exists("index") |
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// Returns a boolean telling whether the entry exists. |
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// Complexity: O(log n). |
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//myarr.find("index") |
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// Returns a mytype& corresponding to the relevant entry. If it doesn't exist, behaviour is undefined. |
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// Complexity: O(log n). |
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//myarr.create("index") |
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// Returns a mytype& corresponding to the relevant entry. If it doesn't exist, it's created. |
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// Complexity: Worst case O(n), reduced to amortized O(log n) if the element should be at the end (strict weak ordering), or O(log n) if the element |
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// exists. |
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//myarr.remove("index") |
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// Removes the element corresponding to the relevant entry. If it doesn't exist, this structure is left untouched. |
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// Complexity: Worst case O(n), reduced to amortized O(log n) if the element is at the end. |
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//myarr.reset() |
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// Clears the data structure, calling all destructors. It is safe to call this function on an empty structure. |
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// Complexity: O(n). |
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//myarr.move("from", "to") |
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// Moves an element from index "from" to "to". If the source doesn't exist, behaviour is undefined. If the target exists, no action is performed. |
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// Complexity: O(n). |
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//myarr["index"] |
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// Similar to myarr.create("index"), but if the returned entry isn't changed by the next call to any function in the same structure, it's removed. |
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// if (myarr["index"]) is safe if type can cast to a bool, and myarr["index"]=4 is also valid if the assignment is valid for a type&. However, it is |
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// not safe to use assocarr<assocarr<int> > myarr; if (myarr["3"]["4"]), since the inner assocarr won't know that it's supposed to be garbage collected, |
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// and the outer one sees that the inner one changed, so you get pollution and memory waste. However, if (myarr["3"].exists("4")) is safe. |
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// Complexity: Same as myarr.create(). |
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//myarr.each(func) |
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// Calls func() for each entry in the structure. func must match the prototype void func(const char * index, mytype& val), but can be a lambda. No |
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// non-const function may be called on this structure from inside func(), but it is safe to call const functions of the structure. The function |
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// calls are in the same order as the indexes, in a strict weak ordering. |
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// Complexity: O(n). |
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//Space usage: O(n). |
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//C++ version: C++98 or C++03, not sure which. |
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//Serializer support: Yes, if mytype is serializable. |
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//"Undefined behaviour" means "segfault" in most cases. |
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#pragma once |
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#include <initializer_list> |
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#include <unordered_map> |
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#include "libstr.h" |
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template<typename right> |
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class assocarr { |
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private: |
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std::unordered_map<string, right> storage; |
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public: |
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bool exists(const char* key) const |
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{ |
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return storage.find(key) != storage.end(); |
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} |
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right& find(const char* key) |
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{ |
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return storage.find(key)->second; |
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} |
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right& create(const char* key) |
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{ |
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return storage[key]; |
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} |
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void remove(const char* key) |
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{ |
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storage.erase(key); |
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} |
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void reset() |
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{ |
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storage.clear(); |
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} |
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assocarr() |
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{ |
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} |
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assocarr(std::initializer_list<std::pair<const char*, right>> list) |
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{ |
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for (auto& it : list) { |
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storage.insert(std::move(it)); |
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} |
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} |
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right& operator[](const char* key) |
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{ |
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return create(key); |
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} |
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//void(*func)(const char * key, right& value) |
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template<typename T> void each(T func) |
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{ |
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for (auto& it : storage) { |
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func(it.first, it.second); |
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} |
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} |
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}; |
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