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operator==,!=,<,<=,>,>=,<=> (std::move_iterator)

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Iterator library
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(C++20)
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(C++17) (C++20)
(C++17)
(C++17)
std::move_iterator
定义于头文件 <iterator>
template < class Iter1, class Iter2 >

bool operator == ( const std:: move_iterator < Iter1 > & lhs,

const std:: move_iterator < Iter2 > & rhs ) ;
(1) (C++17 起为 constexpr)
template < class Iter1, class Iter2 >

bool operator ! = ( const std:: move_iterator < Iter1 > & lhs,

const std:: move_iterator < Iter2 > & rhs ) ;
(2) (C++17 起为 constexpr)
(C++20 前)
template < class Iter1, class Iter2 >

bool operator < ( const std:: move_iterator < Iter1 > & lhs,

const std:: move_iterator < Iter2 > & rhs ) ;
(3) (C++17 起为 constexpr)
template < class Iter1, class Iter2 >

bool operator <= ( const std:: move_iterator < Iter1 > & lhs,

const std:: move_iterator < Iter2 > & rhs ) ;
(4) (C++17 起为 constexpr)
template < class Iter1, class Iter2 >

bool operator > ( const std:: move_iterator < Iter1 > & lhs,

const std:: move_iterator < Iter2 > & rhs ) ;
(5) (C++17 起为 constexpr)
template < class Iter1, class Iter2 >

bool operator >= ( const std:: move_iterator < Iter1 > & lhs,

const std:: move_iterator < Iter2 > & rhs ) ;
(6) (C++17 起为 constexpr)
template < class Iter1, std:: three_way_comparable_with < Iter1 > Iter2 >

constexpr std:: compare_three_way_result_t < Iter1, Iter2 >
operator <=> ( const std:: move_iterator < Iter1 > & lhs,

const std:: move_iterator < Iter2 > & rhs ) ;
(7) (C++20 起)

比较 lhs 与 rhs 的底层迭代器。

1) 仅当 lhs. base ( ) == rhs. base ( ) 格式正确且可转换为 bool 时，此重载参与重载决议。
3-6) 仅当 lhs. base ( ) < rhs. base ( ) 格式正确且可转换为 bool 时，这些重载参与重载决议。

!= 运算符由 operator== 合成 。

(C++20 起)

目录

参数

lhs, rhs - 用于比较的迭代器适配器

返回值

1) lhs. base ( ) == rhs. base ( )
2) ! ( lhs == rhs )
3) lhs. base ( ) < rhs. base ( )
4) ! ( rhs < lhs )
5) rhs < lhs
6) ! ( lhs < rhs )
7) lhs. base ( ) <=> rhs. base ( )

示例

运行此代码 
#include <cassert>
#include <iterator>
int main()
{
    int a[]{9, 8, 7, 6};
    //            │  └───── x, y
    //            └──────── z
    // “x”与“y”相等，但“x”大于“z”
    std::move_iterator<int*>
        x{std::end(a) - 1},
        y{std::end(a) - 1},
        z{std::end(a) - 2};
    // 双向比较
    assert(  x == y );
    assert(!(x != y));
    assert(!(x <  y));
    assert(  x <= y );
    assert(!(x == z));
    assert(  x != z );
    assert(!(x <  z));
    assert(!(x <= z));
    // 三向比较
    assert(  x <=> y == 0 );
    assert(!(x <=> y <  0));
    assert(!(x <=> y >  0));
    assert(!(x <=> z == 0));
    assert(!(x <=> z <  0));
    assert(  x <=> z >  0 );
}

参见

(C++20)
比较底层迭代器与底层哨兵
(函数模板)