在特定的内存地址创建新的 C++ 对象?
在 C++ 中是否可以在特定的内存位置创建一个新对象?我有一块共享内存，我想在其中创建一个对象.这可能吗?
Is it possible in C++ to create a new object at a specific memory location? I have a block of shared memory in which I would like to create an object. Is this possible?
推荐答案
你想要 placement <代码>新().它基本上使用现有内存块调用构造函数，而不是从堆中分配新内存.
You want placement new(). It basically calls the constructor using a block of existing memory instead of allocating new memory from the heap.
在使用之前，请确保您了解有关负责为使用位置 new() 创建的对象显式调用析构函数的说明！
make sure that you understand the note about being responsible for calling the destructor explicitly for objects created using placement new() before you use it!
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