b***i
发帖数: 3043 | 3 看Synopsis
template class shared_ptr {
public:
typedef T element_type;
shared_ptr(); // never throws
template explicit shared_ptr(Y * p);
~shared_ptr(); // never throws
Effects:
If *this is empty, or shares ownership with another shared_ptr instance (use
_count() > 1), there are no side effects.
Otherwise, if *this owns a pointer p and a deleter d, d(p) is called.
Otherwise, *this owns a pointer p, and delete p is called.
可见,你
boost::shared_ptr create(){
boost::shared_ptr p(new B());
return p;
}
我的理解，就是T==A, 但是Y==B，那个构造函数里p是类型B*的。
【在 X*4 的大作中提到】
: 关于boost shared_ptr的，
: #include
: #include
: #include
: class A{
: public:
: virtual void sing() = 0;
: protected:
: virtual ~A(){
: std::cout << "dtor of base" << std::endl;
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