garbage

Why's my vector element all garbage?

由 家住魔仙堡 提交于 2019-12-11 16:01:43
问题 I have a GameLobby class that keeps a list of the currently active games. I want to fetch the active games from a GameLobby (singleton) object, and display these to the user. (Disclaimer: I'm pretty new to C++, so the following code isn't exactly stellar. Neither is it the complete code, but I feel confident that all the relevant instructions have been included.) First some definitions class GamesMenu : public MyGameLayer { private: std::vector<Game*>* _activeGames; void displayGamesList();

WP7 - Xaml Pages and Peak Memory problem

由 徘徊边缘 提交于 2019-12-11 07:39:27
问题 I have a problem with 90mb peak memory limit issue. For example: I create 1 Panorama Application(with default content) and add 3 PivotPages or 6 Portrait Page(Page A and Page B.. with blank content). Each time I navigate and go back between these pages the memory usage is going higher and higher. At the end, It passes the 90mb limit. I use buttons to navigate like this: private void btn1_Click(object sender, RoutedEventArgs e) { NavigationService.Navigate(new Uri("/PageA.xaml", UriKind

why the second printf prints garbage value

由 天大地大妈咪最大 提交于 2019-12-10 11:38:50
问题 this is the source code #include <stdio.h> #include <stdlib.h> int *fun(); int main() { int *j; j=fun(); printf("%d\n",*j); printf("%d\n",*j); return 0; } int *fun() { int k=35; return &k; } output- 35 1637778 the first printf() prints 35 which is the value of k but In the main() the second printf prints a garbage value rather than printing 35.why? 回答1: The problem here is the return from fun is returning the address of a local variable. That address becomes invalid the moment the function

Monitoring CPU, RAM, I/O usage at time of Java Garbage Collection

由 允我心安 提交于 2019-12-09 21:58:05
问题 I am using -Xloggc to output the GC messages to a file. However I am also interested in knowing the system parameters like CPU, Memory, I/O when the GC events happen. I understand that sar linux command is there, but how can I know the metrics at time of GC events instead of manually comparing the results using time stamps. Java 1.7 Oracle enterprise linux 2.6.39 Thanks. 回答1: If you're up to Java 1.7 update 4, you can register a GarbageCollectorMXBean. Here's an example of its setup,

freachable queue and finalization queue

由 好久不见. 提交于 2019-12-07 06:45:07
问题 What is difference between freachable queue and finalization queue? One Solution:Transition from Finalization Queue to FReachable Queue .net Garbage Collection 回答1: Both queues are for the purpose of managing finalizable objects. Reference : What do you know about Freachable queue? Freachable what? You might ask. Freachable (pronounced F-reachable) is one of CLR Garbage Collector internal structures that is used in a finalization part of garbage collection. You might have heard about the

Calling Constructor with in constructor in same class

由 不想你离开。 提交于 2019-12-07 04:51:13
问题 I was expecting the output 2, 3 but I'm getting garbage value. Why's that? Here's my code: #include <iostream> using namespace std; class A { public: int a, b; A() { cout << a << " " << b; } A(int x, int y) { a = x; b = y; A(); // calling the default constructor } }; int main() { A ob(2, 3); return 0; } 回答1: Inside this constructor: A(int x, int y) { a = x; b = y; A(); // calling the default constructor } call A(); creates a new temporary object that is immediately deleted after this

Apache caching javascript assets?

由 我只是一个虾纸丫 提交于 2019-12-06 03:37:15
问题 Not so long ago I was having trouble with javascript assets. When I made changes to them they wouldn't take effect and the file would become invalid javascript (firebug throwing errors and warnings). I noticed that my changes weren't appearing and special characters were being added to the end of the file. A bit more digging and I noticed that the special characters were exactly the number of characters of my edits. Original code: $(document).ready(function(){ alert('what'); }); Adding a line

C# garbage collector seems to be closing my StreamWriter too early

由 我只是一个虾纸丫 提交于 2019-12-06 02:07:59
问题 I have a logger class thats a singleton. In it's destructor I call Close() which prints the footer for the log and then closes the StreamWriter. public void Close() { WriteLogFileFooter(); _logFile.Flush(); _logFile.Close(); } The problem is when System.Enviornment.Exit(1) is called from elsewhere in the program (portions that I didn't write myself), the footer is never printed and my logger throws an exception for trying to write to a closed stream. I can only assume the Exit command is

What is the difference between garbage and dangling references?

由 左心房为你撑大大i 提交于 2019-12-06 01:46:55
问题 What is the difference between garbage and dangling references? 回答1: A dangling reference is a reference to an object that no longer exists. Garbage is an object that cannot be reached through a reference. Dangling references do not exist in garbage collected languages because objects are only reclaimed when they are no longer accessible (only garbage is collected). In some languages or framework, you can use "weak references", which can be left dangling since they are not considered during

Calling Constructor with in constructor in same class

由 守給你的承諾、 提交于 2019-12-05 10:34:30
I was expecting the output 2, 3 but I'm getting garbage value. Why's that? Here's my code: #include <iostream> using namespace std; class A { public: int a, b; A() { cout << a << " " << b; } A(int x, int y) { a = x; b = y; A(); // calling the default constructor } }; int main() { A ob(2, 3); return 0; } Vlad from Moscow Inside this constructor: A(int x, int y) { a = x; b = y; A(); // calling the default constructor } call A(); creates a new temporary object that is immediately deleted after this statement. Because the default constructor A() does not initializes data members a and b then it
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