std::owner_less
Defined in header <memory> | ||
|---|---|---|
template<> struct owner_less<void>; | (since C++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
| 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;
| (1) |
(since C++17) (constexpr since C++26) |
template< class T, class U >
bool operator()( const std::shared_ptr<T>& lhs,
const std::weak_ptr<U>& rhs ) const noexcept;
| (2) |
(since C++17) (constexpr since C++26) |
template< class T, class U >
bool operator()( const std::weak_ptr<T>& lhs,
const std::shared_ptr<U>& rhs ) const noexcept;
| (3) |
(since C++17) (constexpr since C++26) |
template< class T, class U >
bool operator()( const std::weak_ptr<T>& lhs,
const std::weak_ptr<U>& rhs ) const noexcept;
| (4) |
(since C++17) (constexpr since C++26) |
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>) |
__cpp_lib_constexpr_memory | 202506L | (C++26) | Constexpr 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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