31     size_t idx = 0;  in main()  local
32     assert(std::stoull("10g", &idx, 16) == 16);  in main()
33     assert(idx == 2);  in main()
34     idx = 0;  in main()
35     assert(std::stoull(L"10g", &idx, 16) == 16);  in main()
36     assert(idx == 2);  in main()
38     idx = 0;  in main()
41         std::stoull("", &idx);  in main()
46         assert(idx == 0);  in main()
48     idx = 0;  in main()
51         std::stoull(L"", &idx);  in main()
56         assert(idx == 0);  in main()
60         std::stoull("  - 8", &idx);  in main()
65         assert(idx == 0);  in main()
69         std::stoull(L"  - 8", &idx);  in main()
74         assert(idx == 0);  in main()
78         std::stoull("a1", &idx);  in main()
83         assert(idx == 0);  in main()
87         std::stoull(L"a1", &idx);  in main()
92         assert(idx == 0);  in main()
97         std::stoull("9999999999999999999999999999999999999999999999999", &idx);  in main()
102         assert(idx == 0);  in main()
106         std::stoull(L"9999999999999999999999999999999999999999999999999", &idx);  in main()
111         assert(idx == 0);  in main()