29     size_t idx = 0;  in main()  local
30     assert(std::stoull("10g", &idx, 16) == 16);  in main()
31     assert(idx == 2);  in main()
32     idx = 0;  in main()
33     assert(std::stoull(L"10g", &idx, 16) == 16);  in main()
34     assert(idx == 2);  in main()
35     idx = 0;  in main()
38         std::stoull("", &idx);  in main()
43         assert(idx == 0);  in main()
45     idx = 0;  in main()
48         std::stoull(L"", &idx);  in main()
53         assert(idx == 0);  in main()
57         std::stoull("  - 8", &idx);  in main()
62         assert(idx == 0);  in main()
66         std::stoull(L"  - 8", &idx);  in main()
71         assert(idx == 0);  in main()
75         std::stoull("a1", &idx);  in main()
80         assert(idx == 0);  in main()
84         std::stoull(L"a1", &idx);  in main()
89         assert(idx == 0);  in main()
94         std::stoull("9999999999999999999999999999999999999999999999999", &idx);  in main()
99         assert(idx == 0);  in main()
103         std::stoull(L"9999999999999999999999999999999999999999999999999", &idx);  in main()
108         assert(idx == 0);  in main()