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  1. #include <iostream>
  2. #include <memory>
  3. #include <new>
  4. using namespace std;
  5.  
  6. namespace foo {
  7.  
  8. #define BUFSIZE (10000)
  9. char buf[BUFSIZE];
  10. char *bufptr = buf;
  11. int bufcount = 0;
  12.  
  13. void* getnewbuf(int size) {
  14. 	if (size < 1) {
  15. 		throw bad_alloc();
  16. 	}
  17. 	if (bufcount + size + sizeof(int) > BUFSIZE) {
  18. 		throw bad_alloc();
  19. 	}
  20. 	int *len = reinterpret_cast<int*>(bufptr);
  21. 	*len = size;
  22. 	bufcount += sizeof(int);
  23. 	bufptr += sizeof(int);
  24. 	void *ptr = reinterpret_cast<void*>(bufptr);
  25. 	bufptr += size;
  26. 	bufcount += bufcount;
  27. 	cout << "alloc: " << (size + sizeof(int)) << endl;
  28. 	cout << "free: " << (BUFSIZE - (bufptr - buf)) << endl;
  29. 	return ptr;
  30. }
  31.  
  32. }
  33.  
  34. void* operator new (size_t t) { return foo::getnewbuf((int)t); }
  35. void operator delete (void* p) { cout << "delete" << endl; }
  36.  
  37. struct Bar
  38. {
  39. 	static int cnt;
  40. 	int zero[100];
  41. 	int id;
  42. 	Bar() : id(cnt++) { cout << "Bar(): " << id << endl; }
  43. 	~Bar() { cout << "~Bar(): " << id << endl; }
  44. };
  45. int Bar::cnt = 0;
  46.  
  47. int main() {
  48. 	// your code goes here
  49.  
  50. 	int *p = new int;
  51.  
  52. 	delete p;
  53.  
  54. 	Bar *bar = new Bar;
  55.  
  56. 	delete bar;
  57.  
  58. 	try {
  59. 		Bar bbb;
  60. 		auto_ptr<Bar> aaa(new Bar);
  61. 	bar = new Bar[100];
  62.  
  63. 	delete [] bar;
  64. 	}
  65. 	catch (bad_alloc& e) {
  66. 		cout << e.what() << endl;
  67. 	}
  68.  
  69. 	return 0;
  70. }
Success #stdin #stdout 0s 3440KB
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stdin
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Standard input is empty
stdout
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alloc: 8
free: 9992
delete
alloc: 408
free: 9584
Bar(): 0
~Bar(): 0
delete
Bar(): 1
alloc: 408
free: 9176
Bar(): 2
~Bar(): 2
delete
~Bar(): 1
std::bad_alloc
https://ideone.com/kyasPw
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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