c++ - boost::scoped_ptr 的 NULL 检查

Question

我是 boost 框架的新手，我不确定如何检查 scoped_ptr 中的对象是否为 null。

boost::scoped_ptr<CFoo> cFoo(new CFoo);

if(NULL != cFoo)
{
    //todo
}

Answer 1

你可以做到

if(cFoo.get() != 0 ) //what you are trying to do

或者只是

if(cFoo) // as K-Ballo explains.

如 boost::scoped_ptr 所述

conversions

operator unspecified-bool-type () const; // never throws
Returns an unspecified value that, when used in boolean contexts, is equivalent to get() != 0.