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#pragma once
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namespace glcr {
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template <typename T, typename U>
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class Pair {
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public:
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Pair(const T& first, const U& second) : first_(first), second_(second) {}
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T& first() { return first_; }
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U& second() { return second_; }
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private:
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T first_;
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U second_;
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};
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} // namespace glcr
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