std::extents<IndexType,Extents...>:: static_extent

返回在秩索引 i 处的 extents 的静态维度大小。如果秩索引 i 是动态维度，则返回 std::dynamic_extent 。

参数

返回值

静态范围大小或 std::dynamic_extent 值。

示例

#include <iostream>
#include <mdspan>
int main()
{
    std::extents<int, 1, 2> e1;
    std::extents<int, 3, std::dynamic_extent, std::dynamic_extent> e2(4, 5);
    std::cout << e1.static_extent(0) << ", " << e1.static_extent(1) << '\n';
    std::cout << (e2.static_extent(0) == std::dynamic_extent) << ", "
              << (e2.static_extent(1) == std::dynamic_extent) << ", "
              << (e2.static_extent(2) == std::dynamic_extent) << '\n';
}

1, 2
0, 1, 1

参见