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// struct ABC is expensive to copy and should be
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// passed as a const referece.
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struct ABC {
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ABC(const ABC&);
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int get(int) const;
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};
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int f1(int n, const ABC& v1, const ABC& v2); // line 9
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int f1(int n, ABC v1); // line 11
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int f2( int n, const ABC& v2); // line 15
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