set_env.hpp

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// Copyright (c) 2006, 2007 Julio M. Merino Vidal
// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
// Copyright (c) 2009 Boris Schaeling
// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
//
// 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)
 
#pragma once
 
#include <string>
 
#include <boost/process/posix/initializers/initializer_base.hpp>
#include <boost/range/algorithm/transform.hpp>
#include <boost/shared_array.hpp>
 
namespace boost::process::posix::initializers
{
 
    template <class Range>
    class set_env_ : public initializer_base
    {
    private:
        static char*
        get_ptr(const std::string& s)
        {
            return const_cast<char*>(s.c_str());
        }
 
    public:
        explicit set_env_(const Range& envs) : env_(new char*[envs.size() + 1])
        {
            boost::transform(envs, env_.get(), get_ptr);
            env_[envs.size()] = 0;
        }
 
        template <class PosixExecutor>
        void
        on_fork_setup(PosixExecutor& e) const
        {
            e.env = env_.get();
        }
 
    private:
        boost::shared_array<char*> env_;
    };
 
    template <class Range>
    set_env_<Range>
    set_env(const Range& envs)
    {
        return set_env_<Range>(envs);
    }
 
} // namespace boost::process::posix::initializers