stack | 易学教程

The C++ implicit this, and exactly how it is pushed on the stack

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问题 I need to know whether, when a class method in C++ is called, the implicit 'this' pointer is the first argument, or the last. i.e: whether it is pushed onto the stack first or last. In other words, I'm asking whether a class method, being called, is taken by the compiler to be: int foo::bar(foo *const this, int arg1, int arg2); //or: int foo::bar(int arg1, int arg2, foo *const this); By extension therefore, and more importantly, that would also answer whether G++ would push the this pointer

determine stack depth in javascript using javascript

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问题 Is there a way to determine the stack depth of all functions being executed in javascript by using javascript itself? I'm thinking it might involve modifying the Function prototype, but I really don't have any idea. Additionally, it would be nice to be able to break anytime the stack depth were sufficiently high. The reason for this is that I have a stack overflow error in IE which is apparently not debuggable. I'm lazy and I would rather not have to hunt through the code that I'm maintaining

How to check whether a vector is LIFO/FIFO decreasing

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问题 Suppose I have a data.table where each row consists of two vectors: A 'pre-subtraction' vector. A 'post-subtraction' vector. The pre-subtraction is the left-half most column and the post- is the right-most columns, with the suffix "prm" at the end. For example: #Sample Data set.seed(2) fill = data.table(n=1:7) Tp=3 for(t in 1:Tp){ set(x = fill, j = paste0('v',t), value = sample(0:10,7)) } fill[1,paste0('v',3):=0] fill[5,paste0('v',2):=0] fill[5,paste0('v',3):=0] for(t in 1:Tp){ fill[,paste0(

Stack<> implementation in C#

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问题 I've recently been implementing a recursive directory search implementation and I'm using a Stack to track the path elements. When I used string.Join() to join the path elements, I found that they were reversed. When I debugged the method, I looked into the stack and found that the elements themselves were reversed in the Stack's internal array, ie the most recently Push()ed element was at the beginning of the internal array, and the least recently Push()ed element was at the end of the

Clearing Activity Stack

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I am having trouble clearing my app's activity stack. At the start of my app I make the user login and give them a session id. After they login they are able to continue on using the app. However if there session expires I want to redirect them to the login activity and clear the Activity history so they can't have access to the app. I looked at the Android API and the Intent flag FLAG_ACTIVITY_CLEAR_TASK seems to be want I want but it was just included in API level 11 and no phones have the new OS yet. Does anyone have a solution to this problem. Thanks. Stefan Bossbaly I found my answer here

Inferring a method's stack memory use in Java

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问题 I'm trying to determine how much stack memory each method consumes when running. To do the task, I've devised this simple program that will just force a StackOverflowError , public class Main { private static int i = 0; public static void main(String[] args) { try { m(); } catch (StackOverflowError e) { System.err.println(i); } } private static void m() { ++i; m(); } } printing an integer telling me how many times m() was called. I've manually set the JVM's stack size( -Xss VM parameter) to

Move value from local stack to heap? (C++)

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问题 How can I take an object-as-value result from a method call and place it on the heap? For instance: The Qt QImage::scaledToWidth method returns a copy of the QImage object. Right now I'm doing: QImage *new_img_on_heap = new QImage(old_imgage_on_heap->scaledToWidth(2000)); Is this the only way? Seems like it's going through the trouble of making a 3rd whole new object when I already have a perfect good one on the stack. The reason I want to put it on the heap is because the real QImage is

How to remove a stack item which is not on the top of the stack in C#

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问题 Unfortunately an item can only be removed from the stack by "pop". The stack has no "remove" method or something similar, but I have a stack (yes I need a stack!) from which I need to remove some elements between. Is there a trick to do this? 回答1: If you need to remove items that aren't on the top, then you need something other than a stack. Try making your own implementation of a stack from a List. Then you get to implement your own push and pop functions (add & remove on the list), and your

Recursive Stack in C

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during recursion a stack is created what does that stack contains, does it contains the values or it stores the addresses of the operands void recursiveReverse(struct node** head_ref) { struct node* first; struct node* rest; /* empty list */ if (*head_ref == NULL) return; /* suppose first = {1, 2, 3}, rest = {2, 3} */ first = *head_ref; rest = first->next; /* List has only one node */ if (rest == NULL) return; /* reverse the rest list and put the first element at the end */ recursiveReverse(&rest); first->next->next = first; /* tricky step -- see the diagram */ first->next = NULL; /* fix the

Printing Stack Frames

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