31     size_t idx = 0;  in main()  local
32     assert(std::stoul("10g", &idx, 16) == 16);  in main()
33     assert(idx == 2);  in main()
34     idx = 0;  in main()
35     assert(std::stoul(L"10g", &idx, 16) == 16);  in main()
36     assert(idx == 2);  in main()
38     idx = 0;  in main()
41         std::stoul("", &idx);  in main()
46         assert(idx == 0);  in main()
50         std::stoul(L"", &idx);  in main()
55         assert(idx == 0);  in main()
59         std::stoul("  - 8", &idx);  in main()
64         assert(idx == 0);  in main()
68         std::stoul(L"  - 8", &idx);  in main()
73         assert(idx == 0);  in main()
77         std::stoul("a1", &idx);  in main()
82         assert(idx == 0);  in main()
86         std::stoul(L"a1", &idx);  in main()
91         assert(idx == 0);  in main()
96         std::stoul("9999999999999999999999999999999999999999999999999", &idx);  in main()
101         assert(idx == 0);  in main()
105         std::stoul(L"9999999999999999999999999999999999999999999999999", &idx);  in main()
110         assert(idx == 0);  in main()