pop_front.cpp

C++的一个好库。。。现在很流行

// Copyright Aleksey Gurtovoy 2000-2004
//
// 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)
//
// See http://www.boost.org/libs/mpl for documentation.

// $Source: /cvsroot/boost/boost/libs/mpl/test/pop_front.cpp,v $
// $Date: 2004/09/02 15:41:35 $
// $Revision: 1.4 $

#include <boost/mpl/pop_front.hpp>
#include <boost/mpl/list.hpp>
#include <boost/mpl/size.hpp>
#include <boost/mpl/front.hpp>
#include <boost/mpl/aux_/test.hpp>

MPL_TEST_CASE()
{
    typedef list<long>::type types1;
    typedef list<int,long>::type types2;
    typedef list<char,int,long>::type types3;

    typedef pop_front<types1>::type result1;
    typedef pop_front<types2>::type result2;
    typedef pop_front<types3>::type result3;
    
    MPL_ASSERT_RELATION( size<result1>::value, ==, 0 );
    MPL_ASSERT_RELATION( size<result2>::value, ==, 1 );
    MPL_ASSERT_RELATION( size<result3>::value, ==, 2 );
    
    MPL_ASSERT(( is_same< front<result2>::type, long > ));
    MPL_ASSERT(( is_same< front<result3>::type, int > ));
}