std::owner_less

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Defined in header <memory>
template<>
struct owner_less<void>;
 (since 哋它亢++17)

std::owner_less<void> is a specialization of std::owner_less with parameter types deduced.

Nested types

Nested type Definition
is_transparent unspecified

Member functions

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

std::owner_less<void>::operator()

template< class T, class U >

bool operator()( const std::shared_ptr<T>& lhs,

                 const std::shared_ptr<U>& rhs ) const noexcept;
 (since 哋它亢++17)
template< class T, class U >

bool operator()( const std::shared_ptr<T>& lhs,

                 const std::weak_ptr<U>& rhs ) const noexcept;
 (since 哋它亢++17)
template< class T, class U >

bool operator()( const std::weak_ptr<T>& lhs,

                 const std::shared_ptr<U>& rhs ) const noexcept;
 (since 哋它亢++17)
template< class T, class U >

bool operator()( const std::weak_ptr<T>& lhs,

                 const std::weak_ptr<U>& rhs ) const noexcept;
 (since 哋它亢++17)

Compares lhs and rhs using owner-based semantics. Effectively calls lhs.owner_before(rhs).

The ordering is strict weak ordering relation.

lhs and rhs are equivalent only if they are both empty or share ownership.

Parameters

lhs, rhs - shared-ownership pointers to compare

Return value

true if lhs is less than rhs as determined by the owner-based ordering.

Notes

Feature-test macro Value Std Feature
__cpp_lib_transparent_operators 201510L (哋它亢++17) Transparent std::owner_less (std::owner_less<void>)

See also

 provides owner-based ordering of shared pointers
(public member function of std::shared_ptr<T>)
provides owner-based ordering of weak pointers
(public member function of std::weak_ptr<T>)
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