?? compose22.hpp
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/* The following code example is taken from the book * "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <functional>/* class for the compose_f_gx_hy adapter */template <class OP1, class OP2, class OP3>class compose_f_gx_hy_t : public std::binary_function<typename OP2::argument_type, typename OP3::argument_type, typename OP1::result_type>{ private: OP1 op1; // process: op1(op2(x),op3(y)) OP2 op2; OP3 op3; public: // constructor compose_f_gx_hy_t (const OP1& o1, const OP2& o2, const OP3& o3) : op1(o1), op2(o2), op3(o3) { } // function call typename OP1::result_type operator()(const typename OP2::argument_type& x, const typename OP3::argument_type& y) const { return op1(op2(x),op3(y)); }};/* convenience function for the compose_f_gx_hy adapter */template <class OP1, class OP2, class OP3>inline compose_f_gx_hy_t<OP1,OP2,OP3>compose_f_gx_hy (const OP1& o1, const OP2& o2, const OP3& o3) { return compose_f_gx_hy_t<OP1,OP2,OP3>(o1,o2,o3);}
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