std::pmr::operator==, std::pmr::operator!=
Defined in header <memory_resource> | ||
|---|---|---|
template< class T1, class T2 >
bool operator==( const std::pmr::polymorphic_allocator<T1>& lhs,
const std::pmr::polymorphic_allocator<T2>& rhs ) noexcept;
| (1) | (since C++17) |
friend bool operator==( const polymorphic_allocator& lhs,
const polymorphic_allocator& rhs ) noexcept;
| (2) | (since C++17) |
template< class T1, class T2 >
bool operator!=( const std::pmr::polymorphic_allocator<T1>& lhs,
const std::pmr::polymorphic_allocator<T2>& rhs ) noexcept;
| (3) | (since C++17) (until C++20) |
friend bool operator!=( const polymorphic_allocator& lhs,
const polymorphic_allocator& rhs ) noexcept;
| (4) | (since C++17) (until C++20) |
Compares two polymorphic allocators. Two polymorphic allocators compare equal if their underlying memory resource compares equal.
1) Returns
*lhs.resource() == *rhs.resource().
2) Same as (1), allowing conversion to
This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::pmr::polymorphic_allocator is an associated class of the arguments.
polymorphic_allocator.This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::pmr::polymorphic_allocator is an associated class of the arguments.
3) Returns
!(lhs == rhs).
4) Same as (3), allowing conversion to
This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::pmr::polymorphic_allocator is an associated class of the arguments.
polymorphic_allocator.This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::pmr::polymorphic_allocator is an associated class of the arguments.
| The | (since C++20) |
Parameters
| lhs, rhs | - | polymorphic allocators to compare |
Return value
1,2)
*lhs.resource() == *rhs.resource()
3,4)
!(lhs == rhs)
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 3683 | C++17 |
polymorphic_allocator could not be compared with types convertible to it | overload added |
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