一长串大型结构：更喜欢堆或堆栈分配？

Question

I have a struct with much data in it:

struct myStruct
{
  char name[128], desc[128];
  struct Prm { char p_name[32]; int p_val; } parameter[512];
  char Reserved[256]; 
};

The size of the whole struct, as shown in the above example, is 18944 bytes assuming there's no padding; I need 128 of these, that sums up in 2424832 bytes, it's more than 2 Megabytes.

I need to declare this array in the global scope, what's the best way to allocate it? Shall I just do myStruct myData[128]; or declare it as a pointer and initialize with new[] then delete[] it when the program quits? Or maybe a vector?

Will declaring it as a simple array mess with the stack? How can I be sure that it isn't problematic?

Answer 1

列表中更好的选择是std::vector<>

Answer 2

The risk with large arrays is busting your stack. Global variables are not in the stack, so it's fine.