45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#pragma once
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template<class T>
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struct KeyWrapper
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{
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typedef T wrapped_type;
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typedef KeyWrapper<T> self_type;
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enum KeyTypeEnum { KeyType_Normal, KeyType_Empty, KeyType_Deleted };
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KeyTypeEnum type;
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T key;
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KeyWrapper() : type(KeyType_Normal), key(T()) {}
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KeyWrapper(KeyTypeEnum type_) : type(type_), key(T()) {}
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KeyWrapper(const T& key_) : key(key_), type(KeyType_Normal) {}
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KeyWrapper(const self_type& other) : type(other.type), key(other.key) {}
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operator const T&() const { return key; }
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bool isNormal() const { return (type == KeyType_Normal); }
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template<typename KeyComparer>
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struct EqualsComparer
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{
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EqualsComparer(KeyComparer keyComparer) :
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m_KeyComparer(keyComparer)
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{
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}
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bool operator()(const KeyWrapper<T>& left, const KeyWrapper<T>& right) const
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{
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if (left.type != right.type)
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return false;
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if (!left.isNormal())
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return true;
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return m_KeyComparer(left.key, right.key);
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}
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private:
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KeyComparer m_KeyComparer;
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};
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};
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