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Fix subtle bug in fractional_width

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Howard Hinnant committed 2020-09-05 16:34:04 -04:00
1 parent 313189b0a8
commit 5e18488899
2 files changed
+22 -20
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include/date/date.h
+7 -5
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@@ -3685,11 +3685,12 @@ struct undocumented {explicit undocumented() = default;};
// Example: width<4>::value == 2
// Example: width<10>::value == 1
// Example: width<1000>::value == 3
template <std::uint64_t n, std::uint64_t d = 10, unsigned w = 0,
bool should_continue = !(n < 2) && d != 0 && (w < 19)>
template <std::uint64_t n, std::uint64_t d, unsigned w = 0,
bool should_continue = n%d != 0 && w < 19>
struct width
{
static CONSTDATA unsigned value = 1 + width<n, d%n*10, w+1>::value;
static_assert(d > 0, "width called with zero denominator");
static CONSTDATA unsigned value = 1 + width<n%d*10, d, w+1>::value;
};
template <std::uint64_t n, std::uint64_t d, unsigned w>
@@ -3718,9 +3719,10 @@ class decimal_format_seconds
{
using CT = typename std::common_type<Duration, std::chrono::seconds>::type;
using rep = typename CT::rep;
static unsigned CONSTDATA trial_width =
detail::width<CT::period::num, CT::period::den>::value;
public:
static unsigned CONSTDATA width = detail::width<CT::period::den>::value < 19 ?
detail::width<CT::period::den>::value : 6u;
static unsigned CONSTDATA width = trial_width < 19 ? trial_width : 6u;
using precision = std::chrono::duration<rep,
std::ratio<1, static_pow10<width>::value>>;