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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\program_options\environment_iterator.hpp

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// Copyright Vladimir Prus 2004.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_ENVIRONMENT_ITERATOR_VP_2004_05_14
#define BOOST_ENVIRONMENT_ITERATOR_VP_2004_05_14

#include "eof_iterator.hpp"

#include <utility>
#include <string>
#include <cassert>

namespace boost {

    class environment_iterator 
        : public eof_iterator<environment_iterator, 
                              std::pair<std::string, std::string> >
    {
    public:
        environment_iterator(char** environment)
        : m_environment(environment)
        {
            get();
        }
        
        environment_iterator()
        {
            found_eof();
        }
        
        void get()
        {
            if (*m_environment == 0)
                found_eof();
            else {
                std::string s(*m_environment);
                std::string::size_type n = s.find('=');
                assert(n != s.npos);
                value().first = s.substr(0, n);
                value().second = s.substr(n+1);
            }            
            ++m_environment;
        }
        
    private:
        char** m_environment;
    };
}
#endif

environment_iterator.hpp

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