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std::shared_ptr::operators (>=)

STD：：共享[医]PTR：：Operator=，%21=，<，<=，>，>=

Compare two shared_ptr objects​​
template < class T, class U > bool operator==( const shared_ptr<T>& lhs, const shared_ptr<U>& rhs (1)(since C++11)
template< class T, class U > bool operator!=( const shared_ptr<T>& lhs, const shared_ptr<U>& rhs (2)(since C++11)
template< class T, class U > bool operator<( const shared_ptr<T>& lhs, const shared_ptr<U>& rhs (3)(since C++11)
template< class T, class U > bool operator>( const shared_ptr<T>& lhs, const shared_ptr<U>& rhs (4)(since C++11)
template< class T, class U > bool operator<=( const shared_ptr<T>& lhs, const shared_ptr<U>& rhs (5)(since C++11)
template< class T, class U > bool operator>=( const shared_ptr<T>& lhs, const shared_ptr<U>& rhs (6)(since C++11)
Compare a shared_ptr with a null pointer​​
template< class T > bool operator==( const shared_ptr<T>& lhs, std::nullptr_t rhs (7)(since C++11)
template< class T > bool operator==( std::nullptr_t lhs, const shared_ptr<T>& rhs (8)(since C++11)
template< class T > bool operator!=( const shared_ptr<T>& lhs, std::nullptr_t rhs (9)(since C++11)
template< class T > bool operator!=( std::nullptr_t lhs, const shared_ptr<T>& rhs (10)(since C++11)
template< class T > bool operator<( const shared_ptr<T>& lhs, std::nullptr_t rhs (11)(since C++11)
template< class T > bool operator<( std::nullptr_t lhs, const shared_ptr<T>& rhs (12)(since C++11)
template< class T > bool operator>( const shared_ptr<T>& lhs, std::nullptr_t rhs (13)(since C++11)
template< class T > bool operator>( std::nullptr_t lhs, const shared_ptr<T>& rhs (14)(since C++11)
template< class T > bool operator<=( const shared_ptr<T>& lhs, std::nullptr_t rhs (15)(since C++11)
template< class T > bool operator<=( std::nullptr_t lhs, const shared_ptr<T>& rhs (16)(since C++11)
template< class T > bool operator>=( const shared_ptr<T>& lhs, std::nullptr_t rhs (17)(since C++11)
template< class T > bool operator>=( std::nullptr_t lhs, const shared_ptr<T>& rhs (18)(since C++11)

比较两shared_ptr<T>对象或比较shared_ptr<T>带空指针。

注意，比较运算符用于shared_ptr简单地比较指针值；指向的实际对象是不比较一下。有operator<定义为shared_ptr允许shared_ptr在关联容器中用作键，如std::map和std::set...

参数

lhs-the left-hand shared_ptr to compare
rhs-the right-hand shared_ptr to compare

返回值

1%29lhs.get() == rhs.get()

2%29!(lhs == rhs)

3%29std::less<V>()(lhs.get(), rhs.get())，其中V是复合指针类型成std::shared_ptr<T>::element_type*和std::shared_ptr<U>::element_type*

4%29rhs < lhs

5%29!(rhs < lhs)

6%29!(lhs < rhs)

7%29!lhs

8%29!rhs

9%29(bool)lhs

10%29(bool)rhs

11%29std::less<std::shared_ptr<T>::element_type*>()(lhs.get(), nullptr)

12%29std::less<std::shared_ptr<T>::element_type*>()(nullptr, rhs.get())

13%29nullptr < lhs

14%29rhs < nullptr

15%29!(nullptr < lhs)

16%29!(rhs < nullptr)

17%29!(lhs < nullptr)

18%29!(nullptr < rhs)

例外

noexcept规格：

noexcept

注记

在所有情况下，它都是存储的指针%28，它是get()%29，它是比较的，而不是托管指针%28--在使用时传递给删除器的指针。[医]计数到零%29。两个指针在共享中可能有所不同。[医]使用别名构造函数创建的PTR。

例

另见

getreturns the stored pointer (public member function)

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