test/std/utilities/function.objects/comparisons/pointer_comparison_test_helper.hpp

   1 #ifndef POINTER_COMPARISON_TEST_HELPER_HPP
   2 #define POINTER_COMPARISON_TEST_HELPER_HPP
   3
   4 #include <vector>
   5 #include <memory>
   6 #include <cstdint>
   7 #include <cassert>
   8
   9 #include "test_macros.h"
  10
  11 template <class T, template<class> class CompareTemplate>
  12 void do_pointer_comparison_test() {
  13     typedef CompareTemplate<T*> Compare;
  14     typedef CompareTemplate<std::uintptr_t> UIntCompare;
  15 #if TEST_STD_VER > 11
  16     typedef CompareTemplate<void> VoidCompare;
  17 #else
  18     typedef Compare VoidCompare;
  19 #endif
  20     std::vector<std::shared_ptr<T> > pointers;
  21     const std::size_t test_size = 100;
  22     for (size_t i=0; i < test_size; ++i)
  23         pointers.push_back(std::shared_ptr<T>(new T()));
  24     Compare comp;
  25     UIntCompare ucomp;
  26     VoidCompare vcomp;
  27     for (size_t i=0; i < test_size; ++i) {
  28         for (size_t j=0; j < test_size; ++j) {
  29             T* lhs = pointers[i].get();
  30             T* rhs = pointers[j].get();
  31             std::uintptr_t lhs_uint = reinterpret_cast<std::uintptr_t>(lhs);
  32             std::uintptr_t rhs_uint = reinterpret_cast<std::uintptr_t>(rhs);
  33             assert(comp(lhs, rhs) == ucomp(lhs_uint, rhs_uint));
  34             assert(vcomp(lhs, rhs) == ucomp(lhs_uint, rhs_uint));
  35         }
  36     }
  37 }
  38
  39 #endif // POINTER_COMPARISON_TEST_HELPER_HPP