std::extents<IndexType,Extents...>:: fwd-prod-of-extents
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(C++17)
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| Sequence | ||||
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(C++11)
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(C++26)
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(C++26)
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(C++11)
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| Associative | ||||
| Unordered associative | ||||
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(C++11)
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(C++11)
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(C++11)
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(C++11)
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(C++23)
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(C++23)
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(C++23)
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(C++23)
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| Views | ||||
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(C++20)
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(C++23)
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| Tables | ||||
| Iterator invalidation | ||||
| Member function table | ||||
| Non-member function table |
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| Member functions | ||||
| Observers | ||||
| Helpers | ||||
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extents::
fwd-prod-of-extents
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| Non-member functions | ||||
| Deduction guides |
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constexpr
std::
size_t
/*fwd-prod-of-extents*/
(
rank_type i
)
const
noexcept
;
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(C++23 起)
( 仅用于说明* ) |
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返回索引小于 i 的维度的尺寸乘积。若 i <= rank ( ) 为 false 则行为未定义。
参数
| i | - | 待相乘范围中维度的结束索引。 |
返回值
若
i
>
0
为
true
，则返回区间
[
0
,
i
)
内所有
k
对应的
extent
(
k
)
的乘积，否则返回
1
。
参见
返回区间
[
i
+
1
,
rank
(
)
)
内各维度大小的乘积
( 仅用于说明的成员函数* ) |