Easier Usage of the STL Algorithms with Pair Associative Containers (map, hash_map, etc.)

/*-----------------------------------------------------------------------------
File  :	test_call_with.CPP
Title : Test the call_with functors for submission to CodeProject
Owner :	Jay Kint
Tabs  :	column 5 every 4

	Copyright (C) 2004, Jay Kint, All Rights Reserved
-------------------------------------------------------------------------------
Description:
Defines a simple function that will serve as our break point for asserts.

*/



//-----------------------------------------------------------------------------
//							Include Files
//-----------------------------------------------------------------------------

// module includes

// system includes
#include <string>
#if defined(_MSC_VER)
#pragma warning (disable : 4996)
#include <hash_map>
#else
#include <ext/hash_map>
#endif
#include <iostream>
#include <iterator>
#include <functional>
#if !defined(_MSC_VER)
#include <ext/functional>
#endif
#include <algorithm>
#include "call_with.hpp"


//-----------------------------------------------------------------------------
//							Namespaces
//-----------------------------------------------------------------------------

using namespace aux;
using namespace std;
#if !defined(_MSC_VER)
using namespace __gnu_cxx; // some STL implementations do not put hash_map in std
#endif

//-----------------------------------------------------------------------------
//							Internal Types and Structures
//-----------------------------------------------------------------------------


//-----------------------------------------------------------------------------
//							Internal Constants
//-----------------------------------------------------------------------------


//-----------------------------------------------------------------------------
//							Internal Function Prototypes
//-----------------------------------------------------------------------------


//-----------------------------------------------------------------------------
//							Module Variables
//-----------------------------------------------------------------------------

namespace {

hash_map<const char*, int> days_in_month;

vector<int> v;

}


//-----------------------------------------------------------------------------
//							Exported Globals
//-----------------------------------------------------------------------------


//-----------------------------------------------------------------------------
//							Functions - Internal and External
//							All kept alphabetically ordered.
//-----------------------------------------------------------------------------

// familiar month example used 
// mandatory contrived example to show a simple point
// compiled using MinGW gcc 3.2.3 with gcc -c -o file.o file.cpp

template <typename T>
class print : public unary_function<const T,
                                    ostream& >
{
    ostream& out_;
    const char* text_;
public:
    print( ostream& out, const char*text ) : out_(out), text_(text) {}

    ostream& operator()( const T& type ) const { out_ << type; if(text_) out_ << text_; return out_; } 
};

void printi(const int& i )
{
    cout << i << endl;
}

void prints(const string& s )
{
    cout << s << endl;
}

int main(void)
{
    days_in_month["january"] = 31;
    days_in_month["february"] = 28;
    days_in_month["march"] = 31;
    days_in_month["april"] = 30;
    days_in_month["may"] = 31;
    days_in_month["june"] = 30;
    days_in_month["july"] = 31;
    days_in_month["august"] = 31;
    days_in_month["september"] = 30;
    days_in_month["october"] = 31;
    days_in_month["november"] = 30;
    days_in_month["december"] = 31;

    v.push_back(31);
    v.push_back(28);
    v.push_back(31);
    v.push_back(30);
    v.push_back(31);
    v.push_back(30);
    v.push_back(31);
    v.push_back(31);
    v.push_back(30);
    v.push_back(31);
    v.push_back(30);
    v.push_back(31);

    for_each( days_in_month.begin(), days_in_month.end(), with_data( &printi ));
    for_each( days_in_month.begin(), days_in_month.end(), with_data( printi ));
    for_each( days_in_month.begin(), days_in_month.end(), with_data( print<int>(cout, "\n") ));
    for_each( days_in_month.begin(), days_in_month.end(), with_key( &prints ));
    for_each( days_in_month.begin(), days_in_month.end(), with_key( print<string>(cout, "\n") ));

    return 0;
}