BOOST_FOREACH使用簡單例子

迭代MAP

map<int,int> mi;

    for (int x=0;x<10;x++)

    {

        mi.insert(make_pair(x,x+1));

    }

    typedef map<int,int> m;

    BOOST_FOREACH(m::value_type& i,mi)

    {

cout<<i.second<<endl;

    }

迭代字符串

std::string hello( "Hello, world!" );
   
    BOOST_FOREACH( char ch, hello )
    {
        std::cout << ch;
    }

迭代vertor中的vertor

std::vector<std::vector<int> > matrix_int;
BOOST_FOREACH( std::vector<int> & row, matrix_int )
    BOOST_FOREACH( int & i, row )
        ++i;

迭代list

std::list<int> list_int( /*...*/ );
BOOST_FOREACH( int i, list_int )
{
    // 用 i 執行某些操作
}

迭代數組

short array_short[] = {1,2,3};
BOOST_FOREACH( int i, array_short )
{
    // short 被隱式轉換爲 int
}

讓 BOOST_FOREACH 更漂亮 

#define foreach BOOST_FOREACH
#define reverse_foreach BOOST_REVERSE_FOREACH