29     size_t idx = 0;  in main()  local
30     assert(std::stoul("10g", &idx, 16) == 16);  in main()
31     assert(idx == 2);  in main()
32     idx = 0;  in main()
33     assert(std::stoul(L"10g", &idx, 16) == 16);  in main()
34     assert(idx == 2);  in main()
35     idx = 0;  in main()
38         std::stoul("", &idx);  in main()
43         assert(idx == 0);  in main()
47         std::stoul(L"", &idx);  in main()
52         assert(idx == 0);  in main()
56         std::stoul("  - 8", &idx);  in main()
61         assert(idx == 0);  in main()
65         std::stoul(L"  - 8", &idx);  in main()
70         assert(idx == 0);  in main()
74         std::stoul("a1", &idx);  in main()
79         assert(idx == 0);  in main()
83         std::stoul(L"a1", &idx);  in main()
88         assert(idx == 0);  in main()
93         std::stoul("9999999999999999999999999999999999999999999999999", &idx);  in main()
98         assert(idx == 0);  in main()
102         std::stoul(L"9999999999999999999999999999999999999999999999999", &idx);  in main()
107         assert(idx == 0);  in main()