Mega Code Archive
Convenience function for the compose_f_gx_hy adapter
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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 <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <cctype>
using namespace std;
#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);
}
int main()
{
string s("Internationalization");
string sub("Nation");
// search substring case insensitive
string::iterator pos;
pos = search (s.begin(),s.end(), // string to search in
sub.begin(),sub.end(), // substring to search
compose_f_gx_hy(equal_to<int>(), // compar. criterion
ptr_fun(::toupper),
ptr_fun(::toupper)));
if (pos != s.end()) {
cout << "\"" << sub << "\" is part of \"" << s << "\""
<< endl;
}
}
"Nation" is part of "Internationalization"
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