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Add a regression test for here be dragons

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This commit is contained in:
Victor Zverovich
2022-07-22 09:39:36 -07:00
parent c48be439f1
commit 00adc7120d
1 changed files with 32 additions and 3 deletions
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35
test/format-impl-test.cc
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@ -376,6 +376,14 @@ bool operator>=(const double_double& lhs, const double_double& rhs) {
return lhs.a + lhs.b >= rhs.a + rhs.b; return lhs.a + lhs.b >= rhs.a + rhs.b;
} }
struct slow_float {
float value;
explicit constexpr slow_float(float val = 0) : value(val) {}
operator float() const { return value; }
auto operator-() const -> slow_float { return slow_float(-value); }
};
namespace std { namespace std {
template <> struct is_floating_point<double_double> : std::true_type {}; template <> struct is_floating_point<double_double> : std::true_type {};
template <> struct numeric_limits<double_double> { template <> struct numeric_limits<double_double> {
@ -383,14 +391,35 @@ template <> struct numeric_limits<double_double> {
static constexpr bool is_iec559 = true; static constexpr bool is_iec559 = true;
static constexpr int digits = 106; static constexpr int digits = 106;
}; };
template <> struct is_floating_point<slow_float> : std::true_type {};
template <> struct numeric_limits<slow_float> : numeric_limits<float> {};
} // namespace std } // namespace std
FMT_BEGIN_NAMESPACE
namespace detail {
template <> struct is_fast_float<slow_float> : std::false_type {};
namespace dragonbox {
template <> struct float_info<slow_float> {
using carrier_uint = uint32_t;
static const int exponent_bits = 8;
};
} // namespace dragonbox
} // namespace detail
FMT_END_NAMESPACE
TEST(format_impl_test, write_double_double) { TEST(format_impl_test, write_double_double) {
auto s = std::string(); auto s = std::string();
fmt::detail::write<char>(std::back_inserter(s), double_double(42), {}); fmt::detail::write<char>(std::back_inserter(s), double_double(42), {});
#ifndef _MSC_VER // MSVC has an issue with specializing is_floating_point. // Specializing is_floating_point is broken in MSVC.
EXPECT_EQ(s, "42"); if (!FMT_MSC_VERSION) EXPECT_EQ(s, "42");
#endif }
TEST(format_impl_test, write_dragon_even) {
auto s = std::string();
fmt::detail::write<char>(std::back_inserter(s), slow_float(33554450.0f), {});
// Specializing is_floating_point is broken in MSVC.
if (!FMT_MSC_VERSION) EXPECT_EQ(s, "33554450");
} }
#ifdef _WIN32 #ifdef _WIN32