std::shared_ptr::operators (>=)
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
get | returns the stored pointer (public member function) |
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