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Small negative floating point values should trunc and round to -0. instead of 0.

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Howard Hinnant
2016-01-01 15:27:17 -05:00
parent bf5fbe26ff
commit e988efad90
1 changed files with 7 additions and 0 deletions
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7
date.h
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@@ -855,8 +855,13 @@ trunc(T t) NOEXCEPT
static_assert(digits < numeric_limits<I>::digits, ""); static_assert(digits < numeric_limits<I>::digits, "");
CONSTDATA auto max = I{1} << (digits-1); CONSTDATA auto max = I{1} << (digits-1);
CONSTDATA auto min = -max; CONSTDATA auto min = -max;
const auto negative = t < T{0};
if (min <= t && t <= max && t != 0 && t == t) if (min <= t && t <= max && t != 0 && t == t)
{
t = static_cast<T>(static_cast<I>(t)); t = static_cast<T>(static_cast<I>(t));
if (t == 0 && negative)
t = -t;
}
return t; return t;
} }
@@ -894,6 +899,8 @@ round(const std::chrono::duration<Rep, Period>& d)
{ {
auto t0 = floor<To>(d); auto t0 = floor<To>(d);
auto t1 = t0 + To{1}; auto t1 = t0 + To{1};
if (t1 == To{0} && t0 < To{0})
t1 = -t1;
auto diff0 = d - t0; auto diff0 = d - t0;
auto diff1 = t1 - d; auto diff1 = t1 - d;
if (diff0 == diff1) if (diff0 == diff1)