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operator==,!= (std::allocator)

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C++
Memory management library
( exposition only* )
Allocators
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Memory resources
Uninitialized storage (until C++20)
( until C++20* )
( until C++20* )
( until C++20* )

Garbage collector support (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
std::allocator
(1)
template < class T1, class T2 >
bool operator == ( const allocator < T1 > & lhs, const allocator < T2 > & rhs ) throw ( ) ;
(C++11 前)
template < class T1, class T2 >
bool operator == ( const allocator < T1 > & lhs, const allocator < T2 > & rhs ) noexcept ;
(C++11 起)
(C++20 前)
template < class T1, class T2 >

constexpr bool

operator == ( const allocator < T1 > & lhs, const allocator < T2 > & rhs ) noexcept ;
(C++20 起)
(2)
template < class T1, class T2 >
bool operator ! = ( const allocator < T1 > & lhs, const allocator < T2 > & rhs ) throw ( ) ;
(C++11 前)
template < class T1, class T2 >
bool operator ! = ( const allocator < T1 > & lhs, const allocator < T2 > & rhs ) noexcept ;
(C++11 起)
(C++20 前)

比较两个默认分配器。由于默认分配器是无状态的，因此两个默认分配器始终相等。

1) 返回 true 。
2) 返回 false 。

!= 运算符由 operator== 合成生成 。

(since C++20)

参数

lhs, rhs - 用于比较的默认分配器

返回值

1) true
2) false