crypto erase

Files deleted on the computer, usually, if not specially handled, the system simply deletes the file name in the allocation table, and the real data is still on disk. With some data recovery software, it's easy to recover files that have been called deleted. The partition assistant has the ability to erase the disk, it can completely delete the data on the disk, so that the data on the disk can not be erased or deleted by other data recovery software

, then type-erase, and erase to object. The so-called type checking is at the boundary (where the object enters and leaves), checking to see if the type conforms to a certain constraint, and simply includes: The left and right side types of an assignment statement must be compatible. The actual participation of a function call must be compatible with its formal parameter type. The expressio

For the following code: 　　 my_container.erase(iter); My_container is a container of STL, and ITER is an iterator pointing to an element in the container. If it is not in the for, while loop, There is no problem in deleting elements in this way. If you are performing m_container iteration in for and while, deleting all elements that meet the conditions may cause problems. If m_iner iner is iterated in for and while, deleting all elements that meet the conditions may cause proble

There are 2 ways to find the value corresponding to a key:Method 1:typedef std::multimapit = Mmap_.find (Ncallletter);if (It! = Mmap_.end ()){Char key[20] = {0};sprintf (Key, "%i64d", It->first);Qdebug ("key =%s,value =%s\n", Key,it->second.c_str ());}Method 2 is preferable to a case where 1 keys correspond to multiple value:typedef std::multimapPairres = Mmap_.equal_range (ncallletter);while (Res.first! = Res.second){cout cout ++res.first;}2, the correct use of STL map

The containers in the STL are stored in two categories, one for containers that are stored as arrays (e.g. vectors, deque), and those that are stored in discontinuous nodes (for example, list, set, map). There are some issues to be aware of when using the Erase method to remove elements.You can use this when you use list, set, or map traversal to delete certain elements:correct use of Method 1: std::list std::list for (itlist = List.begin (); Itlist!

clip method. The usage is simple:Ctx.save () Ctx.beginpath () Ctx.arc (X2,Y2,A,0,2*MATH.PI); Ctx.clip () Ctx.clearrect (0,0,canvas.width,canvas.height); Ctx.restore ();The above code realizes the erase of the circle area, that is, to implement a circular path, then use this path as the clipping region, then clear the pixels. One thing to note is that you need to save the drawing environment first, to reset the drawing environment after you have clear

is the clip method. The usage is simple:　Ctx.save () Ctx.beginpath () Ctx.arc (x2,y2,a,0,2*Math.PI); Ctx.clip () ctx.clearrect (0,0, Canvas.width,canvas.height); Ctx.restore ();　　The above code realizes the erase of the circle area, that is, to implement a circular path, then use this path as the clipping region, then clear the pixels. One thing to note is that you need to save the drawing environment first, to reset the drawing environment after you

Sequent container: (vector)Erase not only invalidates all iterators pointing to the deleted element, but also invalidates all iterators after the deleted element. Therefore, the erase (ITER ++) method cannot be used, however, the returned value of erase is the next effective iterator. The correct method is ::For (iter = C. Begin (); iter! = C. End ();) Iter = C.

Correct use of the erase method of STL Map In the STL map table, an erase method is used to delete the command node from a map. Eg: Map Typedef Map ITER iter = maptest. Find (key ); Maptest. Erase (ITER ); As shown in the preceding figure, only deleting a single node does not cause task problems, However, when used in a loop, it is often misused b

Flash.There is a big difference between the life of NAND and NOR, the speed of block erase, the chance of error in data storage, and so on.The write operation of any flash device can only be done within an empty or erased unit, so in most cases the erase must be performed before the write operation. The erasure of NAND devices is straightforward, and nor does it require that all bits in the target block be

Sbulla # # CAT/PROC/MTD Dev:size erasesize Name mtd0:00080000 00004000 "Bootloader" mtd1:00180000 00004000 "params" mtd2:00200000 00004000 "Kernel" mtd3:01800000 00004000 "FileSystem1" mtd4:00400000 00004000 "FILESYSTEM2" # loadb 20000000(1) Nand erase 0x100000 0x200000(2) NAND write 0x20000000 0x100000 0x200000-//(3) NAND read 0x20000000 0x100000 0x200000-//(4) TFTP 0x80200000 (memory address) uimage Process from server to memory from insid

I encountered an erase problem today. I had some doubts before. I decided to make it clear today. First, let's look at the Declaration of the function:# Include Iterator erase (iterator LOC );Iterator erase (iterator start, iterator end ); The erase () function either deletes the element at location Loc, or deletes the

Sequential containers::(vectors and lists and deque)The erase iterator not only invalidates all iterators that point to the deleted element, but also invalidates all iterators after the deleted element, so erase (iter++) cannot be used, but the return value of erase is the next valid iterator, so the correct method is:: For (iter = C.begin (); ITER! = C.end ();)i

The 3rd chapter of library function, which is about the problem of library function, is introduced in this chapter. Using library functions can reduce the difficulty of software development and improve the efficiency of code writing. This section introduces the misuse of the Multiset container erase function.Ad:51cto Net + 12th salon: The beauty of big data-how to drive user experience with dataMisuse of erase