memory-management

问题 I understand as Set size of vector of vectors at run time describes, one can declare vector of vector as vector<vector<int> > ref; then resize the first level by ref.resize(i); and push element at the 2nd level: ref[i].push_back(23); But how are vector of vector aligned in memory? For simple vector, it's a container and align its element continuously, like an array ; but in the case of vector of vector, I couldn't see the picture. As the size of each inner vector (the vector in vector of

问题 I understand as Set size of vector of vectors at run time describes, one can declare vector of vector as vector<vector<int> > ref; then resize the first level by ref.resize(i); and push element at the 2nd level: ref[i].push_back(23); But how are vector of vector aligned in memory? For simple vector, it's a container and align its element continuously, like an array ; but in the case of vector of vector, I couldn't see the picture. As the size of each inner vector (the vector in vector of

问题 I understand as Set size of vector of vectors at run time describes, one can declare vector of vector as vector<vector<int> > ref; then resize the first level by ref.resize(i); and push element at the 2nd level: ref[i].push_back(23); But how are vector of vector aligned in memory? For simple vector, it's a container and align its element continuously, like an array ; but in the case of vector of vector, I couldn't see the picture. As the size of each inner vector (the vector in vector of

问题 I came across an issue which I could not resolve. My question is, if I used malloc to allocate memory and then memory block is delete using delete ? The general thumb rule is If we allocate memory using malloc , it should be deleted using free . If we allocate memory using new , it should be deleted using delete . Now, in order to check what happens if we do the reverse, I wrote a small code. #include<iostream> #include<cstdio> #include<cstdlib> using namespace std; class A { int p=10; public

问题 I came across an issue which I could not resolve. My question is, if I used malloc to allocate memory and then memory block is delete using delete ? The general thumb rule is If we allocate memory using malloc , it should be deleted using free . If we allocate memory using new , it should be deleted using delete . Now, in order to check what happens if we do the reverse, I wrote a small code. #include<iostream> #include<cstdio> #include<cstdlib> using namespace std; class A { int p=10; public

问题 I have read that Autofac does a good job of disposing IDisposable resources, but I'm having trouble finding any info on what it does with components that do not have any unmanaged resources, and therefore do not need to implement IDisposable . I would assume these all get garbage collected, but is there any documentation on this scenario? EDIT Asking more specifically, are all Autofac-resolved components required to implement IDisposable ? The docs state that To take advantage of automatic

问题 my project is a dynamic array wrapper like std::vector. this is how it works: when adding a new element, the memory is either allocated (malloc), if it is 0, or reallocated with a new size (realloc), if it is not 0. the size is the number of elements * size of type when getting an already added element, i calculate the address by multiplying its index by the size of the type and adding it to the address at which the memory is allocated NOTE: i write and read the memory myself with no function

问题 I have this: (Get-WMIObject Win32_logicaldisk -computername computer).TotalPhysicalMemory to get size of physical memory installed on remote computer. How do I get the FREE memory of that computer? I've tried (Get-WMIObject Win32_logicaldisk -computername computer).FreePhysicalMemory and some other variants, but with no effect. Is there some list of possible "filters"? 回答1: Whenever you want to see all of the properties of an object, pipe it to Format-List * . Get-WmiObject Win32_LogicalDisk

问题 I have this: (Get-WMIObject Win32_logicaldisk -computername computer).TotalPhysicalMemory to get size of physical memory installed on remote computer. How do I get the FREE memory of that computer? I've tried (Get-WMIObject Win32_logicaldisk -computername computer).FreePhysicalMemory and some other variants, but with no effect. Is there some list of possible "filters"? 回答1: Whenever you want to see all of the properties of an object, pipe it to Format-List * . Get-WmiObject Win32_LogicalDisk

问题 I have pointer object to singleton class. Thread 1: Currently executing a member function of the above said object. Thread 2: Deletes the above object when the object's member function is still being executed by Thread 1. What happens to Thread 1 where the member function is being executed? Whether the execution will be stopped midway? 回答1: It is probably undefined behavior, unless you are extra careful. Deleting the object while your thread accesses it in an unordered (non-synchronized,