How can I overload the new operator for a class type so that it allocates the memory on the stack instead of heap (basically so that the user doesn't have to call delete afterwards). What about something like this: class A{ private: A(int i): this->i(i); {} A a; int i; public: void* operator new(size_t sz){ a(12);
我如何重载一个类类型的新运算符,以便它将堆栈中的内存分配给堆而不是堆(基本上这样用户不必在事后调用delete)。 这样的事情呢? class A{ private: A(int i): this->i(i); {} A a; int i; public: void* operator new(size_t sz){ a(12); } }; 上述解决方案是否有效? 别! 使用自动存储... new操作符被设计为实现动态分配(
I don't really understand when I should be allocating memory on the heap and when I should allocate on the stack. All I really know is that allocating on the stack is faster, but since the stack is smaller I shouldn't use it to allocate large data structures; what other things should I take into account when deciding where to allocate memory? Edit: where should I allocate instance vari
我不明白什么时候应该在堆上分配内存以及何时应该在堆栈上分配内存。 我真正知道的是,在堆栈上分配速度更快,但由于堆栈较小,我不应该使用它来分配大型数据结构; 在决定分配内存的位置时应考虑哪些其他事项? 编辑:我应该在哪里分配实例变量? 在堆栈上分配大多数对象。 生命周期==范围。 如果您需要手动控制对象的生命周期,请将其分配到堆上。 如果对象很大并且堆栈不够大,请将其分配到堆上。 在情况2和3中使
Possible Duplicate: What is the difference between the dot (.) operator and -> in C++? What's the difference between using dot notation and the pointer way? Instantiating an object with or without a pointer. Instantiate w/oa pointer = then use dot notation Instantiate w/ a pointer = then use -> What are the differences between both? When and why should one be used over the
可能重复: 点(。)运算符和 - >在C ++中有什么区别? 使用点符号和指针方式有什么区别? 使用或不使用指针来实例化对象。 实例化W / O指针=然后使用点符号 实例化一个指针=然后使用 - > 两者有什么区别? 何时以及为什么要使用另一个? 如果我理解你的问题:在C ++中, a->b只是(*a).b缩写 - 它们完全一样(编辑:除非你重载它们以表现不同!),它只是首先更容易打字。 :) 如果你指的是使用string
I have an assignment that requires us to implement a doubly linked list class. For some reason they defined the node struct as follows: struct node { node *next; node *prev; T *o; }; It seems to me that it would be a lot easier to write the class if the struct member 'data' were not a pointer. Needless to say I can't change it so I'm going to have to just work a
我有一项任务,要求我们实施一个双链表类。 出于某种原因,他们如下定义节点struct : struct node { node *next; node *prev; T *o; }; 在我看来,如果struct成员的'data'不是一个指针,写这个类会容易得多。 不用说我不能改变它,所以我将不得不解决它。 我尝试实现将元素添加到列表开头的方法,如下所示: template <typename T> void Dlist<T>::insertFront(T *o) { node *np =
I want to create a struct from data harvested by line from a file. Each line necessitates a new struct, and the lines are accessed in a while loop. In C# I did this by creating anonymous structs and adding them to a list of structs. C++ would seem not to allow anonymous structs. I tried naming them with an incrementing variable, but this did not work, as the variable name was taken literally
我想从文件中按行收集的数据创建一个结构体。 每一行都需要一个新的结构,并且这些行在while循环中被访问。 在C#中,我通过创建匿名结构并将它们添加到结构列表中来完成此操作。 C ++似乎不允许匿名结构。 我尝试用增量变量命名它们,但这不起作用,因为变量名是从字面上理解的 - 无论如何,我不希望被迫使用这种方法,因为我讨厌不相关的名称。 我想我可以通过一个独特的属性命名该结构,但显然,我宁愿使用一个属性。
Correction: I messed up with the concept of pointer address and the address the pointer points to, so the following code has been modified. And now it prints out what I want, variable a, c, i, j, k, p are on the stack, and variable b,d are on the heap. Static and global variables are on another segment. Thanks a lot for all of you! Well, I know that these two concepts are deeply discussed.
更正: 我搞砸了指针地址的概念和指针指向的地址,所以下面的代码已被修改。 现在它打印出我想要的,变量a,c,i,j,k,p在堆栈上,而变量b,d在堆上。 静态和全局变量位于另一个段上。 非常感谢你们所有人! 那么,我知道这两个概念深入讨论......但我仍然有以下代码的问题: #include <iostream> using namespace std; class A { }; int N = 10; void f(int p) { int j = 1; float k = 2.0; A c
I'm trying to enable page heap for a small application using GFlags but for some reason it doesn't work. I've written a small C++ application that all it does is corrupt the heap memory: int* a; a= (int*)malloc(1); *a= 8888800; return 0; When running this code the application does not crash. But with page heap enabled I would expect it to, at the third line. I suspect I didn
我试图为使用GFlags的小应用程序启用页堆,但由于某些原因,它不起作用。 我写了一个小的C ++应用程序,它所做的只是损坏了堆内存: int* a; a= (int*)malloc(1); *a= 8888800; return 0; 运行此代码时,应用程序不会崩溃。 但是,在启用页面堆的情况下,我期望它在第三行。 我怀疑我没有正确激活GFlags,但无法弄清楚问题所在。 在图像文件选项卡中运行GFlags exe后,我将路径复制到我的exe文件并标记为启用页堆并停止
There is an old application crashing due to heap corruptions and we want to investigate it. At the moment, dumps are created after every crash but the problem is that heap corruptions do not necessarily crash the application the moment it happens. I want to create an informative dump the moment a heap corruption occurs (using GFlags) even if doesn't crash the application. To test the GFla
由于堆损坏而导致旧应用程序崩溃,我们希望对其进行调查。 目前,每次崩溃后都会创建转储,但问题在于,堆损坏不一定会在应用程序发生时崩溃。 我想在发生堆损坏时使用GFlags创建信息转储,即使不会使应用程序崩溃。 为了测试GFlags功能,我正在编写一个简单的CPP应用程序。 我试图激发一个简单的堆损坏,并不一定会使应用程序崩溃,并看到创建了转储。 然而,我不知道CPP,我找不到这样的腐败的简单例子,这将证明GFlags
I've been busy the last couple of months debugging a rare crash caused somewhere within a very large proprietary C++ image processing library, compiled with GCC 4.7.2 for an ARM Cortex-A9 Linux target. Since a common symptom was glibc complaining about heap corruption, the first step was to employ a heap corruption checker to catch oob memory writes. I used the technique described in https:
在过去的几个月里,我一直忙于调试在一个非常大的专有C ++图像处理库中的某处发生的罕见崩溃,该库使用GCC 4.7.2编译,用于ARM Cortex-A9 Linux目标。 由于一个常见的症状是glibc抱怨堆腐败,第一步是使用堆腐败检查器来捕获oob内存写入。 我使用了https://stackoverflow.com/a/17850402/3779334中描述的技术将所有调用都转移到了free / malloc中,并将其分配给每个已分配的内存块,边界写入 - 但什么也没有发现,即使在每个分
I'm using Windows 8.1 64-bit with Visual Studio 2013 Ultimate. I am porting a program from Linux to Windows which uses C++, OpenGL and SDL. I have the appropriate libraries custom compiled through cmake on 64-bit on Windows. When I run the program from Visual Studio, the IDE says there's a head corruption. This is no surprise since I'm using pointers to instantiate objects, and I&
我在Visual Studio 2013 Ultimate中使用Windows 8.1 64位。 我正在将一个程序从Linux移植到使用C ++,OpenGL和SDL的Windows。 我在Windows上通过64位cmake自定义编译的库。 当我从Visual Studio运行程序时,IDE说有一个头部损坏。 这并不奇怪,因为我使用指针来实例化对象,并且我使用了原始指针,为了争论,我打算将其改为智能指针。 我会在稍后做推动魔术。 与此同时,我用我的Linux计算机通过Valgrind诊断任何内存泄漏