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[SVN r7621]
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Beman Dawes
2000-07-07 16:04:40 +00:00
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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.
*/
/* supplementing compose function objects
* Son Dez 26 22:11:12 MET 1999
*/
#ifndef BOOST_COMPOSE_HPP
#define BOOST_COMPOSE_HPP
#include <functional>
namespace boost {
/**********************************************************
* type nullary_function
* - as supplement to unary_function and binary_function
**********************************************************/
template <class Result>
struct nullary_function {
typedef Result result_type;
};
/**********************************************************
* ptr_fun for functions with no argument
**********************************************************/
template <class Result>
class pointer_to_nullary_function : public nullary_function<Result>
{
protected:
Result (*ptr)();
public:
pointer_to_nullary_function() {
}
explicit pointer_to_nullary_function(Result (*x)()) : ptr(x) {
}
Result operator()() const {
return ptr();
}
};
template <class Result>
inline pointer_to_nullary_function<Result> ptr_fun(Result (*x)())
{
return pointer_to_nullary_function<Result>(x);
}
/*********** compose_f_gx_t and compose_f_gx **********************/
/* class for the compose_f_gx adapter
*/
template <class OP1, class OP2>
class compose_f_gx_t
: public std::unary_function<typename OP2::argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x))
OP2 op2;
public:
// constructor
compose_f_gx_t(const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()(const typename OP2::argument_type& x) const {
return op1(op2(x));
}
};
/* convenience functions for the compose_f_gx adapter
*/
template <class OP1, class OP2>
inline compose_f_gx_t<OP1,OP2>
compose_f_gx (const OP1& o1, const OP2& o2) {
return compose_f_gx_t<OP1,OP2>(o1,o2);
}
/*********** compose_f_gx_hx_t and compose_f_gx_hx **********************/
/* class for the compose_f_gx_hx adapter
*/
template <class OP1, class OP2, class OP3>
class compose_f_gx_hx_t
: public std::unary_function<typename OP2::argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x),op3(x))
OP2 op2;
OP3 op3;
public:
// constructor
compose_f_gx_hx_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 {
return op1(op2(x),op3(x));
}
};
/* convenience functions for the compose_f_gx_hx adapter
*/
template <class OP1, class OP2, class OP3>
inline compose_f_gx_hx_t<OP1,OP2,OP3>
compose_f_gx_hx (const OP1& o1, const OP2& o2, const OP3& o3) {
return compose_f_gx_hx_t<OP1,OP2,OP3>(o1,o2,o3);
}
/*********** compose_f_gxy_t and compose_f_gxy **********************/
/* class for the compose_f_gxy adapter
*/
template <class OP1, class OP2>
class compose_f_gxy_t
: public std::binary_function<typename OP2::first_argument_type,
typename OP2::second_argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x,y))
OP2 op2;
public:
// constructor
compose_f_gxy_t (const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()(const typename OP2::first_argument_type& x,
const typename OP2::second_argument_type& y) const {
return op1(op2(x,y));
}
};
/* convenience function for the compose_f_gxy adapter
*/
template <class OP1, class OP2>
inline compose_f_gxy_t<OP1,OP2>
compose_f_gxy (const OP1& o1, const OP2& o2) {
return compose_f_gxy_t<OP1,OP2>(o1,o2);
}
/*********** compose_f_gx_hy_t and compose_f_gx_hy **********************/
/* 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);
}
/*********** compose_f_g_t and compose_f_g **********************/
/* class for the compose_f_g adapter
*/
template <class OP1, class OP2>
class compose_f_g_t
: public boost::nullary_function<typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2())
OP2 op2;
public:
// constructor
compose_f_g_t(const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()() const {
return op1(op2());
}
};
/* convenience functions for the compose_f_g adapter
*/
template <class OP1, class OP2>
inline compose_f_g_t<OP1,OP2>
compose_f_g (const OP1& o1, const OP2& o2) {
return compose_f_g_t<OP1,OP2>(o1,o2);
}
} /* namespace boost */
#endif /*BOOST_COMPOSE_HPP*/
/* supplementing compose function objects
* Son Dez 26 22:14:55 MET 1999
*/
#ifndef BOOST_COMPOSE_HPP
#define BOOST_COMPOSE_HPP
#include <functional>
namespace boost {
/**********************************************************
* type nullary_function
* - as supplement to unary_function and binary_function
**********************************************************/
template <class Result>
struct nullary_function {
typedef Result result_type;
};
/**********************************************************
* ptr_fun for functions with no argument
**********************************************************/
template <class Result>
class pointer_to_nullary_function : public nullary_function<Result>
{
protected:
Result (*ptr)();
public:
pointer_to_nullary_function() {
}
explicit pointer_to_nullary_function(Result (*x)()) : ptr(x) {
}
Result operator()() const {
return ptr();
}
};
template <class Result>
inline pointer_to_nullary_function<Result> ptr_fun(Result (*x)())
{
return pointer_to_nullary_function<Result>(x);
}
/*********** compose_f_gx_t and compose_f_gx **********************/
/* class for the compose_f_gx adapter
*/
template <class OP1, class OP2>
class compose_f_gx_t
: public std::unary_function<typename OP2::argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x))
OP2 op2;
public:
// constructor
compose_f_gx_t(const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()(const typename OP2::argument_type& x) const {
return op1(op2(x));
}
};
/* convenience functions for the compose_f_gx adapter
*/
template <class OP1, class OP2>
inline compose_f_gx_t<OP1,OP2>
compose_f_gx (const OP1& o1, const OP2& o2) {
return compose_f_gx_t<OP1,OP2>(o1,o2);
}
/*********** compose_f_gx_hx_t and compose_f_gx_hx **********************/
/* class for the compose_f_gx_hx adapter
*/
template <class OP1, class OP2, class OP3>
class compose_f_gx_hx_t
: public std::unary_function<typename OP2::argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x),op3(x))
OP2 op2;
OP3 op3;
public:
// constructor
compose_f_gx_hx_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 {
return op1(op2(x),op3(x));
}
};
/* convenience functions for the compose_f_gx_hx adapter
*/
template <class OP1, class OP2, class OP3>
inline compose_f_gx_hx_t<OP1,OP2,OP3>
compose_f_gx_hx (const OP1& o1, const OP2& o2, const OP3& o3) {
return compose_f_gx_hx_t<OP1,OP2,OP3>(o1,o2,o3);
}
/*********** compose_f_gxy_t and compose_f_gxy **********************/
/* class for the compose_f_gxy adapter
*/
template <class OP1, class OP2>
class compose_f_gxy_t
: public std::binary_function<typename OP2::first_argument_type,
typename OP2::second_argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x,y))
OP2 op2;
public:
// constructor
compose_f_gxy_t (const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()(const typename OP2::first_argument_type& x,
const typename OP2::second_argument_type& y) const {
return op1(op2(x,y));
}
};
/* convenience function for the compose_f_gxy adapter
*/
template <class OP1, class OP2>
inline compose_f_gxy_t<OP1,OP2>
compose_f_gxy (const OP1& o1, const OP2& o2) {
return compose_f_gxy_t<OP1,OP2>(o1,o2);
}
/*********** compose_f_gx_hy_t and compose_f_gx_hy **********************/
/* 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);
}
/*********** compose_f_g_t and compose_f_g **********************/
/* class for the compose_f_g adapter
*/
template <class OP1, class OP2>
class compose_f_g_t
: public boost::nullary_function<typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2())
OP2 op2;
public:
// constructor
compose_f_g_t(const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()() const {
return op1(op2());
}
};
/* convenience functions for the compose_f_g adapter
*/
template <class OP1, class OP2>
inline compose_f_g_t<OP1,OP2>
compose_f_g (const OP1& o1, const OP2& o2) {
return compose_f_g_t<OP1,OP2>(o1,o2);
}
} /* namespace boost */
#endif /*BOOST_COMPOSE_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 <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <iterator>
#include "print.hpp"
#include "compose.hpp"
using namespace std;
using namespace boost;
int main()
{
vector<int> coll;
// insert elements from 1 to 9
for (int i=1; i<=9; ++i) {
coll.push_back(i);
}
PRINT_ELEMENTS(coll);
// for each element add 10 and multiply by 5
transform (coll.begin(),coll.end(),
ostream_iterator<int>(cout," "),
compose_f_gx(bind2nd(multiplies<int>(),5),
bind2nd(plus<int>(),10)));
cout << endl;
}

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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 <vector>
#include <algorithm>
#include <functional>
#include "print.hpp"
#include "compose.hpp"
using namespace std;
using namespace boost;
int main()
{
vector<int> coll;
// insert elements from 1 to 9
for (int i=1; i<=9; ++i) {
coll.push_back(i);
}
PRINT_ELEMENTS(coll);
// remove all elements that are greater than four and less than seven
// - retain new end
vector<int>::iterator pos;
pos = remove_if (coll.begin(),coll.end(),
compose_f_gx_hx(logical_and<bool>(),
bind2nd(greater<int>(),4),
bind2nd(less<int>(),7)));
// remove ``removed'' elements in coll
coll.erase(pos,coll.end());
PRINT_ELEMENTS(coll);
}

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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>
#include "compose.hpp"
using namespace std;
using namespace boost;
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;
}
}

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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 <list>
#include <algorithm>
#include <functional>
#include <cstdlib>
#include "print.hpp"
#include "compose.hpp"
using namespace std;
using namespace boost;
int main()
{
list<int> coll;
// insert five random numbers
generate_n (back_inserter(coll), // beginning of destination range
5, // count
rand); // new value generator
PRINT_ELEMENTS(coll);
// overwrite with five new random numbers
// in the range between 0 (including) and 10 (excluding)
generate (coll.begin(), coll.end(), // destination range
compose_f_g(bind2nd(modulus<int>(),10),
ptr_fun(rand)));
PRINT_ELEMENTS(coll);
}

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/* supplementing compose function objects
* Fri Jul 16 21:01:58 MEST 1999
*/
/* 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.
*/
#ifndef BOOST_COMPOSE_HPP
#define BOOST_COMPOSE_HPP
#include <functional>
namespace boost {
/**********************************************************
* type nullary_function
* - as supplement to unary_function and binary_function
**********************************************************/
template <class Result>
struct nullary_function {
typedef Result result_type;
};
/**********************************************************
* ptr_fun for functions with no argument
**********************************************************/
template <class Result>
class pointer_to_nullary_function : public nullary_function<Result>
{
protected:
Result (*ptr)();
public:
pointer_to_nullary_function() {
}
explicit pointer_to_nullary_function(Result (*x)()) : ptr(x) {
}
Result operator()() const {
return ptr();
}
};
template <class Result>
inline pointer_to_nullary_function<Result> ptr_fun(Result (*x)())
{
return pointer_to_nullary_function<Result>(x);
}
/*********** compose_f_gx_t and compose_f_gx **********************/
/* class for the compose_f_gx adapter
*/
template <class OP1, class OP2>
class compose_f_gx_t
: public std::unary_function<typename OP2::argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x))
OP2 op2;
public:
// constructor
compose_f_gx_t(const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()(const typename OP2::argument_type& x) const {
return op1(op2(x));
}
};
/* convenience functions for the compose_f_gx adapter
*/
template <class OP1, class OP2>
inline compose_f_gx_t<OP1,OP2>
compose_f_gx (const OP1& o1, const OP2& o2) {
return compose_f_gx_t<OP1,OP2>(o1,o2);
}
/*********** compose_f_gx_hx_t and compose_f_gx_hx **********************/
/* class for the compose_f_gx_hx adapter
*/
template <class OP1, class OP2, class OP3>
class compose_f_gx_hx_t
: public std::unary_function<typename OP2::argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x),op3(x))
OP2 op2;
OP3 op3;
public:
// constructor
compose_f_gx_hx_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 {
return op1(op2(x),op3(x));
}
};
/* convenience functions for the compose_f_gx_hx adapter
*/
template <class OP1, class OP2, class OP3>
inline compose_f_gx_hx_t<OP1,OP2,OP3>
compose_f_gx_hx (const OP1& o1, const OP2& o2, const OP3& o3) {
return compose_f_gx_hx_t<OP1,OP2,OP3>(o1,o2,o3);
}
/*********** compose_f_gxy_t and compose_f_gxy **********************/
/* class for the compose_f_gxy adapter
*/
template <class OP1, class OP2>
class compose_f_gxy_t
: public std::binary_function<typename OP2::first_argument_type,
typename OP2::second_argument_type,
typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2(x,y))
OP2 op2;
public:
// constructor
compose_f_gxy_t (const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()(const typename OP2::first_argument_type& x,
const typename OP2::second_argument_type& y) const {
return op1(op2(x,y));
}
};
/* convenience function for the compose_f_gxy adapter
*/
template <class OP1, class OP2>
inline compose_f_gxy_t<OP1,OP2>
compose_f_gxy (const OP1& o1, const OP2& o2) {
return compose_f_gxy_t<OP1,OP2>(o1,o2);
}
/*********** compose_f_gx_hy_t and compose_f_gx_hy **********************/
/* 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);
}
/*********** compose_f_g_t and compose_f_g **********************/
/* class for the compose_f_g adapter
*/
template <class OP1, class OP2>
class compose_f_g_t
: public boost::nullary_function<typename OP1::result_type>
{
private:
OP1 op1; // process: op1(op2())
OP2 op2;
public:
// constructor
compose_f_g_t(const OP1& o1, const OP2& o2)
: op1(o1), op2(o2) {
}
// function call
typename OP1::result_type
operator()() const {
return op1(op2());
}
};
/* convenience functions for the compose_f_g adapter
*/
template <class OP1, class OP2>
inline compose_f_g_t<OP1,OP2>
compose_f_g (const OP1& o1, const OP2& o2) {
return compose_f_g_t<OP1,OP2>(o1,o2);
}
} /* namespace boost */
#endif /*BOOST_COMPOSE_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 <iostream>
/* PRINT_ELEMENTS()
* - prints optional C-string optcstr followed by
* - all elements of the collection coll
* - separated by spaces
*/
template <class T>
inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")
{
typename T::const_iterator pos;
std::cout << optcstr;
for (pos=coll.begin(); pos!=coll.end(); ++pos) {
std::cout << *pos << ' ';
}
std::cout << std::endl;
}