[转] Boost智能指针——scoped_ptr

#include <string>
#include <iostream>
#include <boost/scoped_ptr.hpp>

class implementation
{
public:
    ~implementation() { std::cout <<"destroying implementation\n"; }
    void do_something() { std::cout << "did something\n"; }
};

void test()
{
    boost::scoped_ptr<implementation> impl(new implementation());
    impl->do_something();
}

void main()
{
    std::cout<<"Test Begin ... \n";
    test();
    std::cout<<"Test End.\n";
}

Test Begin ...
did something
destroying implementation
Test End.

namespace boost {

    template<typename T> class scoped_ptr : noncopyable {
    public:
        explicit scoped_ptr(T* p = 0);
        ~scoped_ptr();

        void reset(T* p = 0);

        T& operator*() const;
        T* operator->() const;
        T* get() const;

        void swap(scoped_ptr& b);
    };

    template<typename T>
    void swap(scoped_ptr<T> & a, scoped_ptr<T> & b);
}

成员函数

功能

operator*()

以引用的形式访问所管理的对象的成员

operator->()

以指针的形式访问所管理的对象的成员

reset()

释放所管理的对象，管理另外一个对象

swap(scoped_ptr& b)

交换两个boost::scoped_ptr管理的对象

#include <string>
#include <iostream>

#include <boost/scoped_ptr.hpp>
#include <boost/scoped_array.hpp>

#include <boost/config.hpp>
#include <boost/detail/lightweight_test.hpp>

void test()
{
    // test scoped_ptr with a built-in type
    long * lp = new long;
    boost::scoped_ptr<long> sp ( lp );
    BOOST_TEST( sp.get() == lp );
    BOOST_TEST( lp == sp.get() );
    BOOST_TEST( &*sp == lp );

    *sp = 1234568901L;
    BOOST_TEST( *sp == 1234568901L );
    BOOST_TEST( *lp == 1234568901L );

    long * lp2 = new long;
    boost::scoped_ptr<long> sp2 ( lp2 );

    sp.swap(sp2);
    BOOST_TEST( sp.get() == lp2 );
    BOOST_TEST( sp2.get() == lp );

    sp.reset(NULL);
    BOOST_TEST( sp.get() == NULL );

}

void main()
{
    test();
}