C + + and OPENCV learning notes

Union: when multiple data requires shared memory or multiple data is only one at a time, you can use the Union

1. A consortium is a structure;

2. All of his members have an offset of 0 relative to the base address;

3. This structure space is large enough to accommodate the most "wide" members;

But the size is not only determined by the widest members, but also by considering the individual alignment of each member!

4. Its alignment should fit all of its members.

C + + and OPENCV learning notes