为了避免内存问题,我想使用内存映射文件来管理(读/修改/写入)这些数组,但我找不到工作示例.

我发现的最接近的例子是基于boost :: interprocess的this,但它使用共享内存(而我更喜欢持久存储).

缺乏示例让我担心是否有更好的主流替代解决方案来解决我的问题.是这样的吗？一个最小的例子非常方便.

编辑：

这是在评论中解释我的用例的最小示例：

#include <Eigen/Dense>
 
 
int main()
{
    // Order of magnitude of the required arrays
    Eigen::Index rows = 50000;
    Eigen::Index cols = 40000;
 
    {
        // Array creation (this is where the memory mapped file should be created)
        Eigen::ArrayXXf arr1 = Eigen::ArrayXXf::Zero( rows,cols );
 
        // Some operations on the array
        for(Eigen::Index i = 0; i < rows; ++i)
        {
            for(Eigen::Index j = 0; j < cols; ++j)
            {
                arr1( i,j ) = float(i * j);
            }
        }
 
        // The array goes out of scope,but the data are persistently stored in the file
    }
 
    {
        // This should actually use the data stored in the file
        Eigen::ArrayXXf arr2 = Eigen::ArrayXXf::Zero( rows,cols );
 
        // Manipulation of the array data
        for(Eigen::Index i = 0; i < rows; ++i)
        {
            for(Eigen::Index j = 0; j < cols; ++j)
            {
                arr2( i,j ) += 1.0f;
            }
        }
 
        // The array goes out of scope,but the data are persistently stored in the file
    }
 
}