environment_ex.cpp

C++的一个好库。。。现在很流行

//  (C) Copyright Gennadiy Rozental 2001-2005.
//  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)

//  See http://www.boost.org/libs/test for the library home page.

// Boost.Runtime.Param
#include <boost/test/utils/runtime/env/variable.hpp>
#include <boost/test/utils/basic_cstring/io.hpp>

namespace rt  = boost::runtime;
namespace env = boost::runtime::env;

// STL
#include <iostream>

int main() {
    std::cout << env::get<int>("NUMBER_OF_PROCESSORS") << '\n' << env::get<rt::cstring>("TEMP") << std::endl;

    boost::optional<int> n;

    env::get( "NUMBER_OF_PROCESSORS", n );

    if( n )
        std::cout << n << std::endl;

    return 0;
}

// EOF