NAME¶

std::owner_less - std::owner_less

Synopsis¶

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

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

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, (since C++17)

const std::shared_ptr<U>& rhs ) const noexcept;
template< class T, class U >

bool operator()( const std::shared_ptr<T>& lhs, (since C++17)

const std::weak_ptr<U>& rhs ) const noexcept;
template< class T, class U >

bool operator()( const std::weak_ptr<T>& lhs, (since C++17)

const std::shared_ptr<U>& rhs ) const noexcept;
template< class T, class U >

bool operator()( const std::weak_ptr<T>& lhs, (since C++17)

const std::weak_ptr<U>& rhs ) const noexcept;

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 (C++17) Transparent std::owner_less
(std::owner_less<void>)

See also¶

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