| 40 | { |
| 41 | protected: |
| 42 | bool is_test_valid(const std::ios_base& stream, double value) const |
| 43 | { |
| 44 | const auto floatfield = stream.flags() & std::ios::floatfield; |
| 45 | |
| 46 | #if defined(__GLIBCXX__ ) |
| 47 | // stdlibc++ seems to have a bug where it applies thousands grouping in hexadecimal mode, |
| 48 | // and---even worse---applies the grouping through the "0x" prefix. This produces |
| 49 | // interesting results such as "0,x1.8p+3" instead of "0x1.8p+3" with a grouping |
| 50 | // of "\002", or "0,x,1.8p+3" with a grouping of "\001". |
| 51 | const auto& numpunct = std::use_facet<std::numpunct<char>>(stream.getloc()); |
| 52 | if (floatfield == (std::ios::fixed | std::ios::scientific) && !numpunct.grouping().empty()) |
| 53 | { |
| 54 | return false; |
| 55 | } |
| 56 | #elif defined(_MSC_VER) |
| 57 | // Microsoft Visual C++ has a few problems: |
| 58 | // It doesn't properly ignore the specified precision for hexfloat |
| 59 | if (floatfield == (std::ios::fixed | std::ios::scientific)) |
| 60 | { |
| 61 | return false; |
| 62 | } |
| 63 | // A precision of zero isn't properly handled with a floatfield of "auto" or scientific |
| 64 | if (stream.precision() == 0 && (floatfield == 0 || floatfield == std::ios::scientific)) |
| 65 | { |
| 66 | return false; |
| 67 | } |
| 68 | // Specifying "showpoint" adds a spurious "0" when the value is 0. |
| 69 | if (value == 0 && (stream.flags() & std::ios::showpoint) != 0) |
| 70 | { |
| 71 | return false; |
| 72 | } |
| 73 | #endif |
| 74 | |
| 75 | return true; |
| 76 | } |
| 77 | |
| 78 | void test(double value) const |
| 79 | { |
nothing calls this directly
no outgoing calls
no test coverage detected