RE: [Boost-Users] Boost::lambda: Why the following code would not compile?

From: Ioffe, Robert (robert.ioffe_at_[hidden])
Date: 2003-08-15 14:40:43

The following code works:

#include <string>
#include <map>
#include <vector>
#include <iterator>
#include "boost/lambda/lambda.hpp"
#include "boost/lambda/bind.hpp"
#include "boost/lambda/algorithm.hpp"

using namespace boost::lambda;
using namespace std;

int main() {
        string s;
        typedef map<string, int> counters_t;
        typedef counters_t::value_type counters_value_t;
        counters_t counters;
        typedef map<int, vector<string> > occurences_t;
        typedef occurences_t::value_type occurences_value_t;
        occurences_t number_of_occurences;

        while(cin >> s)
                ++counters[s];

        for(map<string, int>::const_iterator it = counters.begin();
            it != counters.end(); ++it)
                number_of_occurences[it->second].push_back(it->first);

        std::for_each(number_of_occurences.begin(),
number_of_occurences.end(),
                (cout << bind(&occurences_value_t::first, _1) << ":\t"
&& true,
                 bind(ll::for_each(),
                   bind(call_begin(), bind(&occurences_value_t::second,
_1)),
                   bind(call_end(), bind(&occurences_value_t::second,
_1)),
                   protect(cout << _1 << " ")),
                 cout << constant("\n") && true));

        return 0;
}

-----Original Message-----
From: Ioffe, Robert 
Sent: Friday, August 15, 2003 12:24 PM
To: boost-users_at_[hidden]
Subject: [Boost-Users] Boost::lambda: Why the following code would not
compile?

The following code would not compile, since it complains about trying to
copy cout. Any comments?

 

Robert

 

#include <string>

#include <map>

#include <vector>

#include <iterator>

#include "boost/lambda/lambda.hpp"

#include "boost/lambda/bind.hpp"

#include "boost/lambda/algorithm.hpp"

 

using namespace boost::lambda;

using namespace std;

 

int main() {

        string s;

        typedef map<string, int> counters_t;

        typedef counters_t::value_type counters_value_t;

        counters_t counters;

        typedef map<int, vector<string> > occurences_t;

        typedef occurences_t::value_type occurences_value_t;

        occurences_t number_of_occurences;

 

        while(cin >> s)

                ++counters[s];

 

        for(map<string, int>::const_iterator it = counters.begin();

            it != counters.end(); ++it)

                number_of_occurences[it->second].push_back(it->first);

 

        std::for_each(number_of_occurences.begin(),
number_of_occurences.end(),

                (cout << bind(&occurences_value_t::first, _1) << ":\t",

                 bind(ll::for_each(),

                   bind(call_begin(), bind(&occurences_value_t::second,
_1)),

                   bind(call_end(), bind(&occurences_value_t::second,
_1)),

                   protect(cout << _1 << " ")),

                 cout << "\n"));

 

        return 0;

}

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