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std::owner_less

STD：业主[医]再少点

Defined in header ​​
template<> struct owner_less<void>;​(since C++17)

std::owner_less<>是std::owner_less并推导出参数类型。

成员类型

Member typeDefinition
is_transparent/* unspecified */

注记

成员类型is_transparent向调用方指示此函数对象是透明FunctionObject：它接受任意类型的参数，并使用完美的转发，这避免了在异构上下文中使用函数对象或使用rvalue参数时不必要的复制和转换。特别是模板函数，例如std::set::find和std::set::lower_bound在它们的Compare类型。

成员函数

operator()compares its arguments using owner-based semantics (function)

STD：业主[医]再少点<void>*操作员%28%29

template bool operator()( const std::shared_ptr& lhs, const std::shared_ptr& rhs ) const;​(since C++17)
template<class T, class U> bool operator()( const std::shared_ptr<T>& lhs, const std::weak_ptr<U>& rhs ) const;​(since C++17)
template<class T, class U> bool operator()( const std::weak_ptr<T>& lhs, const std::shared_ptr<U>& rhs ) const;​(since C++17)
template<class T, class U> bool operator()( const std::weak_ptr<T>& lhs, const std::weak_ptr<U>& rhs ) const;​(since C++17)

比较lhs和rhs使用基于所有者的语义。有效呼叫lhs.owner_before(rhs)...

排序是严格弱序关系。

lhs和rhs只有当它们都是空的或共享的所有权时，它们才是等价的。

参数

lhs, rhs-shared-ownership pointers to compare

返回值

true如果lhs是少于rhs由业主依据订单确定。

例外

noexcept规格：

noexcept

另见

owner_beforeprovides owner-based ordering of shared pointers (public member function of std::shared_ptr)
owner_beforeprovides owner-based ordering of weak pointers (public member function of std::weak_ptr)

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在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/Memory/Owner[医]再少点[医]空隙

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