Mirror of forum.nim-lang.org

1855 :: These code how to implement in the nim.

• Angluca (orginal) [2015-12-07T11:34:47+01:00] view original

  Such as

  int* getInstance() {
      static int* inst = (int*)malloc(4);
      return inst;
  }
  
  for(int i=0;i < 10; ++i)
      getInstance()
  Run

  "static int* inst = (int*)malloc(4);" excute only once at this code, How to implement it when I use nim code. ( don't use emit pragma )

---

• Araq (orginal) [2015-12-07T12:21:24+01:00] view original

  You can use this

  proc getInstance(): ptr int =
    var inst {.global} = cast[ptr int](alloc sizeof(int))
    result = inst
  Run

  But I prefer to just use a global variable as that is more honest, you have global state.

---

• Angluca (orginal) [2015-12-07T12:50:39+01:00] view original

  Oh great!! It's ok, Thank you!

  "var inst {.global} = castptr int" I only need this perform once function, Convenient to use test code, , It don't worry about memory address changes and out of memory.

---