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allocated object. Shared_ptr can also be securely placed in the standard container and make up for the defects that STD: auto_ptr and qscopedpointer cannot use pointers as container elements because of the transfer semantics.Qweakpointer and STD: weak_ptr Qsharedpointer of the strong reference type is already very useful. Why do we need qweakpointer of the weak reference type? Qweakpointer is a smart pointer introduced in combination with qsharedpointer. It is more like a helper of qsharedpoint

have much say in how it standards are applied to the scheme. If a scheme is being implemented, a sub-system will be promoted. Ensure that there is a parallel environment because it is a test environment and all backup disks, which will prolong the life of the solution. #2:What maintenance channels are available? Write down the phone number, email address, and website address. Clearly mark the maintenance chain. For example, you can add "call Jim of the engineering department first, and then cal

){}}; Auto_ptr (auto_ptr_ref Auto_ptr operator = (auto_ptr_ref Operator auto_ptr_ref Operator auto_ptr 1. constructor and destructorAuto_ptr obtains the ownership of an object (ownership) during construction and releases the object during structure analysis. We can use auto_ptr to improve code security:Int * P = new int (0 );Auto_ptr From then on, we don't have to worry about when to release P, or worry about memory leakage in case of exceptions.Note the following points:1) because the auto_p

to lock an object:Public static void enter (Object OBJ );When you call the enter method, it first checks whether the specified object's syncblockindex is negative. If yes, this method finds an idle syncblock from the syncblock cache and saves its index to the syncblockindex of the object. Once the syncblock is associated with the object, the enter method checks the syncblock of the object to see if another thread currently owns the syncblock. If no p

The mutex class in the system. Threading namespace is used to control the connections between multiple threads without conflict or repetition. We can regard mutex as a taxi and passengers as a thread. The passenger first waits for the car, then gets on the bus, and finally gets off the bus. When a passenger is in the car, other passengers can get on the car only after they get off the bus. This is also the relationship between the thread and the mutex object. The thread uses mutex. the waitone (

; Acc end; (_,Acc) -> Acc end,[], AppList), io:format("Found ~p processes~n", [length(Procs)]), Procs.get_procs2(Leader) -> lists:filter( fun(Pid) -> case process_info(Pid, group_leader) of {_, Leader} -> true; _ -> false end end, processes()).format_fprof_analyze() -> case file:consult("fprof.analysis") of {ok, [_, [{totals, _, _, TotalOWN}] | Rest]} -> OWNs =

wild pointer. Otherwise, it will lead to a very difficult-to-find bug, null Pointer eliminates similar problems 3. the weak pointer is mainly used for the "Parent-Child" relationship. The father owns a son's strong pointer, so the father is the son's owner. To prevent the ownership loop, the son needs to use the weak pointer to direct to the father. A typical example is the delegate mode. Your viewcontroller has a uitableview through the strong poin

not let yagni destroy your chances of success. 6) aggregate code ownershipAnyone in the group should have the right to change the code to improve it. Everyone has all the code, which means everyone is responsible for it. This technology allows people to make necessary changes to some code without passing through the personal bottleneck of the code owner. Everyone is responsible for this fact to eliminate the chaos caused by no code ownership. The statement "everyone

we can calculate the integer d = 120 that satisfies 7 * D = 1 mod 103, that is, 7*103 = 1 mod 103/120, 7 *, and more than 1: P = 11 q = 13 N = 143 E = 7 d = 103 (n, e) = (143,7) (N, d) = (143,103) Take data encryption as an example: A sends confidential data M = 85 to B, and the Public Key (n, e) = (143,7) of B is known. Therefore, the following formula can be calculated: C = m ^ e mod n = 85 ^ 7 mod 143 = 123 Party A sends C to Party B, and Party B uses the private key (n, d) = (143,1

executionEntercriticalsectionAndLeavecriticalsectionUnless you useInitializecriticalsectionThe critical section is initialized. 1.2.2 Note: 1.Only one thread is allowed to access the critical area at a time. Each thread must call the critical area mark (that is, oneCritical_sectionGlobal variable)EntercriticalsectionOther threads that want to gain access will be put in sleep state, and before being awakened, the system will stop allocating themCPUTime slice. In other words,The critic

The mutex class in the system. Threading namespace is used to control the connections between multiple threads without conflict or repetition. We can regard mutex as a taxi and passengers as a thread. The passenger first waits for the car, then gets on the bus, and finally gets off the bus. When a passenger is on the bus, other passengers can only get on the bus after they get off the bus. This is also the relationship between the thread and the mutex object. The thread uses mutex. the waitone

linked list with three elements have a head node N0; That node holds a shared_ptr object that owns the next node, N1; That node holds a shared_ptr object that owns the next node, N2; That node, in turn, holds a shared_ptr object that owns the head node, N0, closing the cycle. In this situation, none of the reference counts would ever become zero, and the nodes i

a is assigned to B. If a no longer uses this memory, it only needs to subtract the reference count by 1, indicating that it no longer owns the memory. b The reference count is also reduced by 1 when the memory is no longer used. When the reference count becomes 0, the memory is no longer referenced by any pointers, and the system can release it directly.Summary: The above two is actually the difference between assign and retain, assign is the direct

Authorization is access control, which determines whether the user has appropriate access to the resource in the application. For example, determine whether a user has permission to view the page, edit the data permissions, have permissions for a button, have permission to print, and so on. I. Three elements of authorization Authorization has three core elements: permissions, roles, and users. Permissions Permissions are the core elements of Apache's Shiro security mechanism. It explicitly

the same time. Log on to the root account to create a directory and a file. # Create a directory mkdir abc # Create a file touch abc.txt # View ls-all You will find: # Directory starting with d and file starting, and drwxr-xr-x 2 root 4096 Jun 6 abc-rw-r -- 1 root 0 Jun 6 abc.txt First look at the blue part above. The first part is the identifier. remove the first part and separate each three digits. take the abc folder as an example: d | rws | r-x In the abc folder, the owner

at the time of Creation 未被拥有 and 未激发 state;2. Call Wait ... () function, the thread obtains Hmutex ownership, Hmutex momentarily becomes the excitation state, then wait ... The () function returns, at this time the state of the Hmutex is 被拥有 and 未激发 ;3, after ReleaseMutex, the state of Hmutex becomes 未被拥有 and 未激发 stateMutex considerations: The ownership of the mutex does not belong to which thread that produced it, but the last wait for this mutex ... () operation and a thread that has

In C ++, auto_ptr dynamically allocates objects and automatically clears objects when they are no longer needed. 1. the constructor and the Destructor auto_ptr obtain the ownership of an object during the constructor construction and release the object during the analysis. We can use auto_ptr to improve code security: Int * p = new int (0 ); Auto_ptr From then on, we don't have to worry about when to release p, or worry about memory leakage in case of exceptions. Note the following points: 1)

The mutex is very similar to the critical section, where only the thread that owns the mutex can access the shared resource, and the mutex has only one, so it is guaranteed that only one thread can access the shared resource at the same time and that it achieves thread synchronization.The mutex is more advanced than the critical section and can be named to support thread synchronization across processes. Mutexes are calls to the Win32 API for mutex op

Talking about iOS memory management mechanism and ios Memory Management The principle of iOS memory management mechanism is reference counting. reference counting is simply to count the ownership of a piece of memory. When this piece of memory is created, its reference counting increases from 0 to 1, indicates that an object or pointer holds the memory and owns the memory. If another object or Pointer Points to the memory, to indicate the ownership of

are very similar to the behavior of critical segments, and mutexes can be used for mutually exclusive access to resources in different processes. Using mutex mutexes will primarily use four functions.Handlecreatemutex (Lpsecurity_attributeslpmutexattributes,//Indicates security control, general direct pass-through nullBoolbinitialowner, //whether the creator (the main thread in this case) owns the mutex, and the same as the critical section, there is