예제 #1
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 bool operator()(const key_type& x, ticket_type yk) const { return x.here() < yk; }
예제 #2
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 bool operator()(ticket_type xk, const key_type& y) const { return xk < y.here(); }
예제 #3
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 bool operator()(const key_type& x, const key_type& y) const { return x.here() < y.here(); }