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  1. #include <stdio.h>
  2. #include <memory>
  3. #include <vector>
  4. #include <list>
  5.  
  6. namespace mmap_allocator_namespace {
  7.   template <typename T>
  8.     class mmap_allocator: public std::allocator <T> {
  9.       public: typedef size_t size_type;
  10.       typedef T * pointer;
  11.       typedef
  12.       const T * const_pointer;
  13.  
  14.       template <typename _Tp1>
  15.       struct rebind {
  16.         typedef mmap_allocator <_Tp1> other;
  17.       };
  18.  
  19.       pointer allocate(size_type n,
  20.         const void * hint = 0) {
  21.         fprintf(stdout, "Alloc %d bytes.\n", n * sizeof(T));
  22.         return std::allocator <T> ::allocate(n, hint);
  23.       }
  24.  
  25.       void deallocate(pointer p, size_type n) {
  26.         fprintf(stdout, "Dealloc %d bytes (%p).\n", n * sizeof(T), p);
  27.         return std::allocator <T> ::deallocate(p, n);
  28.       }
  29.  
  30.       mmap_allocator() throw (): std::allocator <T> () {
  31.         fprintf(stdout, "Hello allocator!\n");
  32.       }
  33.       mmap_allocator(const mmap_allocator & a) throw (): std::allocator <T> (a) {}
  34.       template <class U>
  35.       mmap_allocator(const mmap_allocator <U> & a) throw (): std::allocator <T> (a) {}~mmap_allocator() throw () {}
  36.     };
  37. }
  38.  
  39. using namespace std;
  40. using namespace mmap_allocator_namespace;
  41.  
  42. int main() {
  43.   // раскомментируем нужное:	
  44.   // vector<int, mmap_allocator<int>> int_vec(32, 0, mmap_allocator<int>());
  45.   // list<int, mmap_allocator<int>> int_lst(32, 0, mmap_allocator<int>());
  46.   return 0;
  47. }
Success #stdin #stdout 0s 4384KB
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https://ideone.com/mwgKgA
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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