how to erase imac

Today, we found that some STL: map code runs well in windows, but it cannot be compiled in Linux: "no match for 'operator = 'in' iter = ". It is actually a simple line of code: Iter = map. Erase (ITER) The description of MAP: erase on msdn is as follows: Iterator erase (iterator it );Iterator erase (iterator firs

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

First, IntroductionReview Javac The compilation process of the solution syntax sugar when you see the generic erase in the example, the information on the Internet is mostly more specific, in this make their own some detailed and understandable summary.Ii. Introduction of generic typeGenerics are a new feature of JDK 1.5, a paradigm used by compilers, a kind of syntax sugar that guarantees type safety. Note: In inheritance, the subclass generic number

Erase statement Reinitialize the elements of a fixed-size array and release the storage space for the dynamic array. Erase array The array parameter is the name of the array variable to clear. Description It is important to determine whether an array is a fixed-length array (regular) or a dynamic array, because Erase to perform different operations based on the t

Use Iterator/reverse_iterator for Erase usage in traversal Roche (http://blog.csdn.net/kesalin/) This article follows the "signed-non-commercial-consistent" authoring common agreement It is well known that when iterating through an STL container using an iterator, special attention needs to be paid to whether the iterator is modified in the loop and causes the iterator to fail. Let me conclude by summarizing the use of iterators correctly when deleti

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

Author: arm-WinCE In many forums on the internet, I have seen a question: how can applications directly read and write flash sectors, or a similar question. In short, it is hoped that the application can directly access the flash device, directly read and write data in the sector, or perform other operations. I tried to introduce my methods to you. First, let's give a brief introduction. Wince supports flash devices, generally nandflash or norflash. The FAL + FMD architecture is used. We imple

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

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

Failure of STL iterator Containers in STL are divided into two types by storage method. One is the sequential containers (such as vector and deque) stored in arrays ); another type of containers are stored in the form of discontinuous nodes (such as list, set, and map ). When using the erase method to delete elements, pay attention to some issues. 1. Use an unordered container to traverse and delete (list, set, map) When using list, set, or map trav

Erase in the loop:(1) For an associative container, nothing is returned after erase, and subsequent iterators cannot be down, that is, you cannot perform ++it or it--operations. What needs to be done is to it++ the iterator when it is deleted, so that it is OK to go down.(2) For a sequence container, the next iterator is returned after erase, but causes all subse

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!

Erase operation Problem of STL vector One boss said csdn on the blog ("Erase operation on STL vectors", address is: http://blog.csdn.net/tingya/archive/2007/12/28/1998442.aspx) Black Strange, Holding the mentality of curiosity, I also go to gather ha lively, found a little problem, report to everyone. The author says the following code is wrong: vector M_uintvector.push_back (10); M_uintvector.push_ba

The erase function is prototype as follows:(1) string erase (size_t Pos = 0, size_t n = NPOs );(2) iterator erase (iterator position );(3) iterator erase (iterator first, iterator last );That is to say, there are three usage methods:(1) Erase (Pos, n); Delete n characters s

The role of erase is to invalidate the iterator as a parameter and return the iterator pointing to the next parameter of the iterator. As follows: list ParticleSystem;list::iterator pointer;if(pointer->dead == true){ pointer = ParticleSystem.erase(pointer);} There is a program about erase error. using namespace std;int main(){ std::listtest_list; std::list::iterator test_list_it; test_list.push_back(1)

C ++ code 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475 # Include # Include # Include # Include # Include Using namespace STD;/*Iterator erase (const_iterator position );Iterator erase (const_iterator first, const_iterator last );*/Void print (const vector {Vector For (; iter! = V. End (); ++ ITER

The erase function is prototyped as follows:(1) string erase (size_t pos = 0, size_t n = NPOs);(2) Iterator erase (iterator position);(3) Iterator erase (iterator first, iterator last);That means there are three ways to use:(1) Erase (pos,n); Deleting n characters starting f