nearest.cc
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sun, 19 Jul 2009 19:44:48 +0200
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/**
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 * I am experimenting with templates...
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 *
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 */
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#include <iostream>
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#include <list>
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#include <vector>
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#include <algorithm>
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#include <stdexcept>
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#include <iomanip>
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typedef short MYTYPE;
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namespace cute {
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    template <typename Iter, typename T>
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    Iter find (const Iter begin, const Iter end, const T& query)
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    {
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        Iter it;
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        for (it = begin; it != end; it++) {
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            if (query == *it)
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                return it;
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        } return it;
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    }
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    template <typename Iter, typename T>
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    void nearest (const Iter begin, const Iter end, const T& query)
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    {
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        Iter it, current;
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        current = it = cute::find (begin, end, query);
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        if (current == end)
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            return;
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        while (current != end) {
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            std::cout << *current << std::endl;
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            current++;
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        }
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        current = --it;
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        do {
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            std::cout << *current << std::endl;
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        } while ((current--) != begin);
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    }
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    template <class C, class T>
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    typename C::iterator nearest (C& con, const T& query)
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    {
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        typename C::iterator it;
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        for (it = con.begin (); it != con.end (); it++) {
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            if (query == *it)
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                return it;
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        }
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        return it;
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    }
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};
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using namespace std;
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int main (int argc, char **argv)
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{
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    MYTYPE value, query;
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    vector <MYTYPE> vec;
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    list <MYTYPE> lis;
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    for (int i = 0; i < 10; i++) {
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        cout << "[" << std::setw (2) << i << "] Enter a value: ";
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        cin >> value;
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        if (cin) {
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            vec.push_back (value);
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            lis.push_back (value);
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        } else
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            throw runtime_error ("BAD INPUT");
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    }
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    sort (vec.begin (), vec.end ());
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    lis.sort ();
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    cout << "Enter a value to search: ";
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    cin >> query;
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    cute::nearest (vec.begin (), vec.end (), query);
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    cute::nearest (lis.begin (), lis.end (), query);
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    cute::nearest (lis, query);
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    return 0;
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}